Keto Myths, My Starbucks Keto Iced Coffee & Maltodextrin Hype vs Truth


Every time I share a picture of my Starbucks keto iced coffee, there’s a flurry of “that’s not keto!” comments mixed with concerned questions…

Specifically about the maltodextrin in (some) Starbucks sugar free syrups, and whether that kicks you out of ketosis or spikes your insulin worse than sugar.

Today I want to clear that up. ๐Ÿ™‚

Starbucks Maltodextrin Keto Test - Does it spike blood sugar

Keto Myths & Maltodextrin Hype

There are many “keto myths” floating around the web, getting repeated countless times without any real proof. People speak on keto like this or that is a hard fact, without anything to back it up other than “I heard…”

Then there’s also the source they heard it from, and the facts (truths) – as well as the facts that are NOT shared in those sources.

I’ll share an example on that so you can see what I mean, which should help you make more informed decisions (and do further research yourself) in the future.

For this post I’m using maltodextrin and my Starbucks order as an example as just one of many common “keto scares.” But what you’ll learn here can help you understand (or better research) similar “hot topics” in the keto community.

The big thing you’ll always hear about anything that contains maltodextrin (and thats A LOT of things!) is that it’s glycemic index is almost twice as high as sugar, and that it will spike your blood sugar through the roof.

You’ll learn what maltodextrin IS and reasons you may want to avoid it, which of the Starbucks sugar-free syrups have maltodextrin and which do not, why people say maltodextrin is “not keto” and more.

You’ll also get to see my blood sugar results – where I tested it on myself.

I’ll give you everything you need to know to decide for yourself…

Maltodextrin Blood Sugar Spike or Hype Keto Talk

What IS Maltodextrin?

Maltodextrin is basically just an additive. It’s used as a preservative, a thickener and a filler. It’s also used as a carrier, to add other ingredients to products.

It’s in A LOT of products such as: vitamins, baby formula, beer, beef jerky, medicines, protein bars & shakes, dressings, electrolyte drink mixes, sodas, you name it – you’ll often find it in STEVIA even.

You’ve been consuming and using maltodextrin ALL your life, so it’s nothing new since you went keto. It’s even in personal care products like lotion, shampoo, etc.

There are plenty of reasons NOT to love Maltodextrin but you should make your decision based on ALL the facts. And that decision can be personal to you.

It truly is JUST a preference, not a “keto rule.” ๐Ÿ˜‰

What you’ll often hear in keto communities is maltodextrin is “worse than sugar” – meaning the glycemic index is higher than sugar. The last part is true.

Dr. Eric Berg says maltodextrin is “very severe on your blood sugar” in this video. In another video he says “so if it’s that high on the glycemic index, it’s creating a MASSIVE SURGE in your blood sugar when you consume it.”

I don’t disagree with most of the points in his video, only two of them. First, maltodextrin IS gluten free even when it’s made from wheat: “the processing that wheat starches undergo in the creation of maltodextrin renders it gluten-free.” –source

I also disagree with his comment: “so if it’s that high on the glycemic index, it’s creating a MASSIVE SURGE in your blood sugar when you consume it.”

I’ll explain why. Because I love Dr. Berg and his work. ๐Ÿ˜‰

I’m not saying Maltodextrin is great or even good or that there aren’t reasons you may choose to avoid foods that contain it.

I’ll share all the details with you, then that’s a decision you can make for yourself.

Maltodextrin vs Sugar in Blood Glucose Test

Maltodextrin vs Sugar

(The BIG Point Nobody Mentions!)

The fact that most people are leaving out of their argument that maltodextrin IS THE DEVIL is that there is such a SMALL amount of it in any one serving or any one food or drink you may consume – so you are NOT consuming equal amounts of sugar and maltodextrin, EVER.

That is the (huge) point nobody ever explains.

You simply cannot compare maltodextrin and sugar in that way, as if they are equal, because it would be a highly RARE case that you are consuming more than a TINY amount of maltodextrin – a trace amount, really.

Consider drinking a Starbucks iced coffee with regular vanilla syrup vs sugar-free vanilla syrup. The grams of sugar in a regular sweetened iced coffee vs the grams of maltodextrin in a sugar-free iced coffee are not even comparable.

Let’s look at a real-life example…

Starbucks Iced Coffee is served “lightly sweetened” by default, but is not AT ALL sweet so you would never know it. The classic syrup (sugar water) they add by default has 30 grams of sugar in a 24oz Venti Iced Coffee.

Hidden Sugar in Starbucks Iced Coffee

If you add 4 pumps of regular vanilla syrup (not sugar free) to your iced coffee, that’s 20 grams of sugar per tbsp – assuming a pump is a tbsp. When you include the Classic Syrup (30 grams of sugar) you have a total of 110 grams of sugar in a Venti iced coffee with 4 pumps of vanilla syrup.

We’ll use this comparison because the Starbucks sugar-free vanilla syrup has maltodextrin in it.

Compare that to what I would order: a Venti iced coffee with “no classic syrup” (without the sugar water) and 4 pumps of sugar-free vanilla syrup.

Even if you counted 1 carb per pump (some people do, some don’t), that comes to 4 carbs vs 110 carbs.

Again: 20 grams of sugar per pump of regular vanilla syrup, or 20 carbs vs 1 carb per pump of sugar-free vanilla syrup.

See the difference?! ๐Ÿ˜‰

Obviously you are NOT consuming equal amounts of sugar and maltodextrin.

That’s the point no one mentions when they say maltodextrin has a higher glycemic index than sugar. I can’t personally think of a situation on a keto diet where you would consume more than a tiny amount of maltodextrin – and certainly never comparable to the amount of sugar in a high carb version of the same food or drink.

Further down you’ll see that Starbucks lists their sugar free syrups as ZERO carbs per 2 TBSP serving on the nutrition facts label. So I’m not sure who started the rumor that they were 1 carb per pump. Or maybe it’s a round up / round down issue. I have no idea. But I doubt the total carb count of the sugar free syrup (whatever it is) is from the maltodextrin alone, which again – is a trace amount.

Still, in that tiny amount…

Does maltodextrin cause a “MASSIVE SURGE” in your blood sugar?

That’s what I set out to test…

Starbucks Keto Iced Coffee

My Starbucks Keto Iced Coffee Order

The photo above was an iced coffee I had from Starbucks this week. I had two actually because I was in the city several days this week. I only have them now and then, it’s not a daily thing just a treat, because I don’t have a Starbucks where I live. ๐Ÿ™‚

First, you should know: my coffee order is SWEET and it’s HUGE.

I sip on it most of the day and rarely ever finish one in a day. I’ll stick it in the refrigerator and finish it the next day most of the time, even.

That amount of heavy cream usually makes me feel full too, so I eat less on the days I have it. It almost serves as a meal replacement! It has about the same amount of calories as a BPC or fatty coffee, depending on the amount of cream you ask for.

Here’s what I order – and this is how I say it:

Trenta Iced Coffee
no classic syrup
5 pumps of sugar free cinnamon dolce
4 pumps of sugar free vanilla
and heavy whipping cream – only about 1/3 cup please

I usually say that with my fingers showing I mean 1/3 cup – not one third of THE cup. If I don’t specify the 1/3 cup of heavy cream, I log it as at least half a cup. They can get pretty heavy handed with the cream for my taste. ๐Ÿ˜‰

I’ll show you how I log it (carb count, etc) further down too…

For the purpose of my blood glucose / blood ketone test on this Starbucks iced coffee order (to see if it’s REALLY keto friendly), I ordered a smaller size (24oz vs 31oz) with the same amount of ingredients:

Keto Starbucks Maltodextrin in Sugar Free Syrups

I did that because I wanted to be able to drink the entire thing in under an hour, like I would guess most people do – instead of sipping on it throughout the day.

I’ve been drinking that same Starbucks order over the last year with NO problem, and with my ketone levels holding steady, but for this test I wanted to consume it all at once.

I got one and stuck it in the fridge so I could do this testing at home the next day.

Let me just say… THIS tasted super sweet, more like a milkshake. ๐Ÿ˜›

I would not normally get this much sweetener in a smaller iced coffee like this, but I wanted to really put this “maltodextrin” issue in the sugar free vanilla to the test.

Starbucks: Keto Approved!

If that iced coffee had NOT been ordered sugar free and with no classic syrup, it would have been 210 grams of sugar – plus 3.2 carbs for the heavy cream – for a total of 213.2 carbs.

I didn’t order this coffee, a friend brought it to me so I could do this test, so I definitely logged this one with half a cup of HWC (3.2 carbs) vs my usual 1/3 cup request (2.1 carbs).

Again, I’ll show you how I log it below, but even if you DID count 1 carb per pump of sugar free vanilla (the one with maltodextrin), that would come to 4 + 3.2 for a total of 7.2 carbs. I don’t log the syrups because they have zero nutritional value (no carbs, no calories), so I only log the HWC in my daily macro tracking.

On the high end, for the people DO that log EVERY pump as one carb, my order would be 12.2 carbs. Still nowhere near the 213.2 carbs for a NON sugar free version, or the 210 grams of sugar. ๐Ÿ˜‰

Let’s dive into the test results…

Maltodextrin Blood Sugar Test with a Blood Glucose Meter

Does Maltodextrin REALLY Spike Your Blood Sugar?

The image above is my starting numbers for this test: my glucose and ketone levels before I drank the keto Starbucks iced coffee.

My glucose seemed a little high to start at 99. My baseline is around 85. My ketone levels were my normal level (1.3) for that time of day.

I use the Keto Mojo Blood Glucose & Ketone Testing Kit and that link will get you 15% off. If you want to learn more about it, here’s where I did a VERY enlightening video interview with the founder of Keto Mojo.

Keto Mojo Discount

For the purpose of this “keto test” I drank the ENTIRE 24 ounce Starbucks iced coffee within 30 minutes.

This one was sweeter than my usual order (a smaller cup with the same amount of cream & sugar free syrups) – so it basically tasted like a MILKSHAKE. ๐Ÿ˜›

I wanted to really put that “maltodextrin creates a MASSIVE SURGE in your blood sugar when you consume itโ€ comment to the test. ๐Ÿ˜‰

30 minutes after drinking the entire coffee, I tested again:

Maltodextrin Insulin Spike Test - Blood Sugar and Ketone Levels were fine

As you can see, my blood sugar actually came DOWN.

My ketone levels dropped slightly too, but that’s not unusual as they fluctuate throughout the day and before/after you eat. I was still IN KETOSIS at 0.9 and my blood sugar did NOT spike. The opposite actually.

I tested again one full hour after having the coffee:

Maltodextrin Ketone Test - Keto Friendly or Not

The result…

The Starbucks Iced Coffee is keto friendly. No question.

4 full pumps of sugar free vanilla syrup with maltodextrin did NOTHING to my blood sugar levels. Zilch – no impact.

So there ya go. ๐Ÿ™‚

Keto Myths: Maltodextrin Hype or Fact?

You may still want to avoid maltodextrin for your own personal reasons, which is totally fine. I did a little homework for you – so you know which syrups to NOT choose at Starbucks if that’s your preference…

Starbucks Sugar Free Syrups & Maltodextrin

Starbucks used to offer more sugar free syrup flavors, but right now it seems that at most locations you can only get sugar free vanilla or sugar free cinnamon dolce.

The sugar free vanilla DOES contain maltodextrin, and the sugar free cinnamon dolce does NOT.

Here are the Sugar Free Syrups that are currently available year round:

If you click each link, you can view the labels and nutrition facts.

ALL of them say ZERO carbs per 2 TBSP serving.

I think they’ve discontinued the sugar-free hazelnut and caramel syrups, as well as the sugar free peppermint syrup which used to be available during the holidays.

NOTE: their “whipped cream” HAS SUGAR IN IT so you definitely want to avoid that and use heavy cream or half & half in your Starbucks orders instead.

HWC in MyFitnessPal (Carb Creep)

How I Log My Starbucks Keto Friendly Iced Coffee in MyFitnessPal

Some people say the syrups are 1 carb per pump. They don’t affect me and the labels say ZERO on the bottles you buy to use at home, so I don’t log them – but that’s a personal choice (too).

I log the amount of HWC (heavy whipping cream) I ask for which is usually 1/3 cup – or if I don’t specify or it looks lighter than usual, I log it as 1/2 cup (half a cup) to be safe.

Heavy Whipping Cream is 0.4 per tbsp, regardless of what your label says.

When it comes to labeling, they are able to round up or round down.

Anything less than half a carb can be labeled as zero, which is why most heavy whipping cream labels say zero carbs.

That can really add up on you in recipes though! ๐Ÿ˜‰

There are 16 TBSPs in a cup, making HWC 6.4 carbs per cup…

HWC - Accurate Carb Count for Heavy Whipping Cream (NOT zero carbs)

You simply want to find an entry in MyFitnessPal, or the tracker you use, that counts heavy whipping cream (HWC) as 1 carb for 2 TBSP. It’s also 50 calories per TBSP if you’re counting calories.


Individual Results May Vary

It’s worth noting that everyone may respond differently to various types of sugar free sweeteners or foods/products. It’s also worth noting that most people DO NOT properly do clean testing like I do, so their results may be skewed or diluted.

I do a full six day clean test on any new food or ingredient. That means I eat super simple known/tested foods (eggs, pecans, beef, etc) and often mono meals (single ingredient meals) for 72 hours prior to a glucose/ketone test.

I do this to get my body to baseline numbers, or optimal ketone/glucose levels, and so that there are NO other factors affecting my test.

I then test a single new food or ingredient (or Starbucks order), and follow that with another 72 hours of clean eating. I do that because it can take up to 72 hours to fully metabolize anything you consume – and longer if you drink alcohol.

I mentioned all of this in my recent sugar free chocolate chips keto test post & video.

I said then and I’ll say again: I don’t trust anyone else’s results.

That’s for two reasons. First because we are all different. And second because I don’t know ANYONE that does a full 6-day CLEAN test, and doesn’t take a single bite of anything else questionable. ๐Ÿ˜‰

This is a matter of comparing avocados to avocados – instead of avocados to apples.

Back to maltodextrin which is apparently “THE KETO DEVIL” according to keto communities and self-proclaimed keto gurus… I found it very interesting that the whole craze is based solely on a glycemic index comparison ONLY.

It’s simply not a fair comparison, as I demonstrated.

A trace amount, and that’s what it is: a TRACE amount, of maltodextrin is not at all the same as a serving of sugar – in any food or in any situation. Unless you’re testing a full TBSP of each side by side, which is just silly.

As for me, I’m going to continue enjoying my keto-friendly Starbucks iced coffees. ๐Ÿ™‚

It’s really such a minor thing to cause such a HUGE stir across keto communities, in my opinion anyway.

I’m sure I’ve been consuming maltodextrin pretty much all my life, way before I went keto, and in more foods and products than I even care to know about.

I just can’t be bothered to scrutinize every little ingredient ALL the time, or to cut out something so ENJOYABLE as my sugar free iced coffee – which is a treat, by the way, not a daily thing but an occasional indulgence.

I also don’t gulp down the entire thing but rather sip on it and usually drink maybe half, then stick it in the refrigerator and finish the rest of it the next day.

I think at the point that I would get THAT picky about every single ingredient and trace additive in any food or ingredient or bottle of shampoo… I’d also have to question taking my next breath…

You can’t possibly believe the AIR is clean on this polluted planet we live on. ๐Ÿ˜›

But that’s just me. I want to live freely and enjoy my life, and enjoy the widest range of flavors and foods and experiences, while staying in nutritional ketosis. Simple!

Like I said, it’s a personal preference. My coffee date friend prefers NOT to consume maltodextrin. He also doesn’t eat beef or pork. All personal choices, and all fine by me. He orders the iced coffee with heavy cream and sugar free cinnamon dolce syrup, then adds a packet of stevia from his pocket.

Just between you and I, his stevia packets list dextrose as the first ingredient – which is pretty much the same thing as maltodextrin (proof). ๐Ÿ™‚ ๐Ÿ™‚ Shhhh!!

Dextrose and maltodextrin are very similar. Something to Google if you’re interested. Also, anytime it says “natural flavors” maltodextrin may be used as the carrier for those. I always find it sketchy when “natural flavors” is listed as an ingredient – with no explanation of what those are exactly.

But again, if it tastes good and tests good – I’ll probably eat it. ๐Ÿ™‚

Thoughts or Questions on Keto Starbucks or Maltodextrin?

Leave a comment and let’s chat!

Lynn Terry,
aka @LowCarbTraveler

p.s. This is the kind of thing I absolutely LOVE to dig into and research/test. While I’m sipping my Starbucks coffee full of maltodextrin, of course… ๐Ÿ˜‰

This is the reason you need to do your own testing though, in all seriousness. Don’t just blindly believe everything you read or watch online, or heard somewhere.

It’s all about knowing how YOUR body responds to certain foods or ingredients, your bio-individuality, and not giving in to hype and sensationalism and silly arguments or scare tactics – but testing for the TRUTH.

Here is our 15% off discount link for the Keto Mojo Testing Kit

Keto Mojo Discount


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About Lynn Terry

I love making the low carb diet EASY for people with a busy lifestyle (like me!) with my KISS / Keep It Simple method. :) About Lynn Terry: Host of the Low Carb Challenge
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33 Responses to Keto Myths, My Starbucks Keto Iced Coffee & Maltodextrin Hype vs Truth

  1. Chris Wood says:

    What about their skinny mocha sauce Lynn? Fascinating stuff, thanks for testing!!!

  2. Shelia Favor says:

    Great article. I try to eat clean but don’t freak out too much.

  3. Lynn, as always, I appreciate you doing thoughtful, time-consuming research like this and sharing what you find! I typically take my own HWC and SF syrup when I get coffee out. I track everything in MFP, too, but I just like to know exactly what Iโ€™m getting. Probably anal that way. LOL I eat in restaurants maybe once a week and just look at the their sitesโ€™ nutritional info. I generally trust what theyโ€™re doing but know thereโ€™s a margin of error โ€” which I donโ€™t stress over, because a girlโ€™s gotta live her keto/low-carb life!

  4. Shelia Favor says:

    I agree Melanie. When I see people not eat a steak out because they are afraid the seasonings might have sugar I am thinking they way over thinking this. I do bring my own sugar free BBQ sauce if I can but I don’t beat myself up. I think.that is why.people give up on keto or think it is not sustainable

  5. Valerie says:

    Lynn, most diabetes educators recommend testing postprandial blood glucose at one-hour post meal. Have you tried that?

    I’ve got T1D and I wear a continuous glucose monitor, which is pretty cool to be able to watch my blood glucose in live time! ๐Ÿ™‚

  6. Suzy says:

    So, is it ok to eat some of the sugar free candy that is sweetened with malto dextrose? Iโ€™d like a Russel Stover peanut butter cup as a treat now and then, but shun it because of the sweetener.

  7. Lauren says:

    Thank you for this great information, Lynn. Iโ€™ve learned so much in reading your emails/articlesโ€” your various food tests, as well as products you recommend have made my keto journey much more successful. I really appreciate your common sense approach to keto, mixed with the โ€œtrust but verifyโ€ mentality! Nice to have one less thing to feel keto-guilt about!

  8. Tracy says:

    I love it when you test and get real technical ( means I donโ€™t have too). You are a trusted source for sure. Thank you.

  9. Megan says:

    It’s post like these that make me love your blog and keep coming back. Thank you for doing all of this work and research and sharing it. This is also one of the reasons I stopped instagramming my food and sharing tips even though people were asking for it. It was just too annoying dealing with the comments and the know-it-alls. We’re all different and different foods and different sweeteners affect each of us in different ways and we all have to do this LCHF diet in a way that works for us, our bodies and our lifestyles. Thanks again.

  10. Jessica says:

    Thank you for this information, Lynn! This is why I love your website and you! You are scientific about testing your blood glucose and ketones, yet you understand that people are busy and need to enjoy life and keep things simple (KISS). Your style of doing low-carb is the best I’ve seen yet! When you say “nutritional ketosis”, do you mean <2.0 GKI (Index)?

  11. Pam says:

    I tried using the Starbucks app to check the carb count, but I kept getting 30 grams using only the SF cinnamon dulce, no classic and HWC. Any idea why it is so high??

    • Lynn Terry says:

      Hi Pam,

      I always order inside so I’m not sure, but on Instagram they said you have to UNcheck classic syrup or simple syrup under the Syrups tab on the app. Did you try that?

    • Lisa says:

      Starbucks doesnโ€™t update the nutrition info based on what you select. They only show the original version.

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  14. Deb says:

    I have tested my sugars after drinking a sf vanilla iced coffee with no classic and almond milk. My sugars skyrocket! Also I tested the actual coffee with my glucose meter and it registered almost 300. Why is this?
    Iโ€™m not keto just diabetic and have noticed after my coffee my sugar gets high.

    • Julie Blackman says:

      You might check with your Starbucks, but it is my understanding that their Almond milk is not unsweetened, so that might be affecting your numbers.

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  18. JSM says:

    You should do this again and test properly. Test before drinking the drink, one hour after and then two hours after. Any spike over 20 points. Means that itโ€™s no good

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  20. Denise Payne says:

    Thank you for being so honest! Im not a planner or much of a cook. I appreciate your tips for eating on the go!

  21. Olivia says:

    You go girl! Thank you for all that valuable information, loved it! We should ALL keep our eyes on our own plate…lol

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  23. cindy baugh says:

    Super informative! I’m so thankful you can eat clean like that to do testing. I could never do that. We do share the same philosophy about not worrying about the tiny stuff though. Life is too short to worry about some stuff.

  24. Kristin Walker says:

    I was having the same issue with the app and then I read what it says. (a couple of times so I could understand it). Apparently, the only thing that will affect a change on the nutrition label in the app is the cup size. Every other customization does not register on the final nutrition label. I think that is really misleading!

  25. tigertye says:

    Hi Lynn ๐Ÿ™‚

    Not being a starbucks customer at all I won’t comment on anything about your test other than to say that, as usual, you explain things very carefully so your results/reactions are understandable to everyone.

    That said I normally don’t have a problem with tiny amounts of maltodextrin though I do check labels to be sure it’s way down the list of ingredients if it is there at all. I do have an issue with one particular product I bought in the past. A huge issue really. It’s a store brand cup for cup sugar replacement sweetened with stevia and the bulking agent is matlodextrin. Yes I am sure of this as there’s only 2 things listed in the ingredients. I made two batches of cookies to compare it, one with sugar and one with the stevia replacement. At that time I didn’t realize what maltodextrin really was, I thought it was just fiber. While the sugar free cookie was quite edible and tasted good that sucker about ruined by body for 3 days. yup, one cookie. The shakes from the blood sugar spike were totally unexpected but lasted no longer than normal sugar shakes for me. The disgusting and painful effects it had on my bowels however lasted 3 days. My husband ate the rest of the cookies and not one at a time lol. He had NO issues with the maltodextrin at all.

    I no longer use products that have higher lvls of maltodextrin because my body is now more sensitive to it. We may be inured to it since it is in so many packaged products as a minor ingredient but in larger quantites it is not something I would recommend to anyone but like I said my hubby didn’t have the same physical response to it that I did. I also have a nasty and extremely sudden physical response to nutrasweet. I tend to test new sweeteners very very carefully. If I want any LC sweets at all I have to make my own as I have yet to find stevia cookies/muffins/cakes in any store .

    I love it when you dig into the products you eat/drink to figure out what they really are ๐Ÿ™‚

    Have a happy!

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