Ingredients to avoid on a low-carb or keto diet

Ingredients to avoid on a low-carb or keto diet

If you can focus on healthy, whole foods and keep high-carb and potentially unhealthy ingredients out of your cart, you set yourself up for low-carb or keto success.

But do we need to completely avoid certain ingredients? Or can we limit them and still partake in small amounts? Of course, that depends on your goals and your reaction to these ingredients. Here is our take on the four key ingredients to look for when buying packaged goods: sugar, starch, industrial fats, and sugar replacements.

Print this list and bring it with you to the market.



1. Limit sugar

Sugar ingredients

Few ingredients send our blood sugar and insulin on a rollercoaster like sugar. While some may be able to enjoy it in very small amounts, like in one or two squares of dark chocolate, we should otherwise try to eliminate added sugars from our diet.

Why are there so many names for sugar? This is one of the games that food companies play. If food manufacturers call sugar something else, you will be less likely to recognize it and more likely to buy.

Some food manufacturers will even use a couple of different kinds of sugar in a product so it will have less of each kind. That way, they can list the sugary ingredients farther down on the ingredient list, so buyers won’t know how much sugar is in there. Tricky, right?

What might sugar be called in the ingredient list on packaged foods?

Sounds like sugar—
Barbados sugar
Beet sugar
Brown sugar
Cane sugar
Castor sugar
Coconut sugar
Coconut palm sugar
Confectioner’s sugar
Corn Sugar
Date sugar
Demerara sugar
Golden sugar
Granulated sugar
Grape sugar
Icing sugar
Invert sugar
Muscovado sugar
Palm Sugar
Powdered sugar
Raw sugar
Turbinado sugar
Yellow sugar
Sounds like syrup—
Brown rice syrup
Buttered syrup
Carob syrup
Corn syrup
Corn syrup solids
Golden syrup
High fructose corn syrup
High maltose corn syrup
Malt syrup
Refiner’s syrup
Rice syrup
Sorghum syrup
Sounds cryptic—
Barley malt
Cane juice
Cane juice crystals
Dehydrated cane juice
Evaporated cane juice
Diastatic malt
Florida crystals

Sometimes special sugars (other than sucrose) are listed by their scientific name. And sometimes sugar finds it way into your food as a natural ingredient, like maple syrup. So watch for these possibilities, too:

Sounds like a chemical—
Ethyl maltol
Glucose solids
Sounds natural—
Agave nectar
Blackstrap molasses
Coconut nectar
Dried Fruit
Fruit juice
Fruit juice concentrate
Maple syrup
Whatever the name, sugar is sugar, so limit all forms. If you miss a hidden sugar on the ingredient list, the carbohydrate count on the nutrition facts label boils carbohydrate content down to one number! More on that in our guide about several ways to use the nutrition facts label.

2. Limit starch

Organic Whole Grains

When eating low-carb, limiting or completely avoiding refined starch is key. Wheat and corn are the biggest sources of starch in our food supply, so keep your eye out for those two primary offenders. Some people may be able to do just fine with an occasional starchy vegetable or a small amount of starch in their recipes (i.e. as a stabilizer or thickening agent). Just keep an eye on the carb count and how it makes you feel (even better if you can check your blood glucose).

But if your goal is to avoid starch completely, you need to stay away from all grains and almost all kinds of flour, with the exception of nut flours. And you need to avoid starchy vegetables like beans and tubers, too.

So watch for ingredients like these and keep products made with them out of your cart:

Grains & grain-like seeds—
Wild Rice
Other names for wheat—
Graham flour
Wheat berries
White flour
Flours, starches, & thickeners—
Chickpea flour or Gram
Fava bean
Modified starch
Powdered cellulose
Plantain or Banana
Starchy vegetables
Sweet potatoes & yams
Vegetable starch

Worried about baking without grains? Fear not. Low-carb baking is still possible with ingredients like almond flour, coconut flour, and psyllium husk powder. Check out our guide low-carb baking 101, to learn more.

For help finding low-carb nut flours and other specialty items, check out our guide on how to shop for low-carb extras online.

You might want to check out our low-carb bread recipes, too.


3. Limit industrial fats

checking for bad fats

All fats are not created equal. Reviewing the ingredient list on products at the supermarket — before you buy — can help you eat more healthy, naturally-occurring fat and avoid or limit industrial oils.

We encourage you to completely avoid artificially produced trans fats, usually listed as “partially hydrogenated” oil or vegetable shortening. These fats are banned in Europe and are in the process of being eliminated from the US food supply due to concerns about their health effects.1

In addition, we suggest you minimize margarine and the highly-processed vegetable oils listed below. Unlike olive oil, coconut oil, and nut oils that are pressed and minimally processed, most vegetable oils are produced with high heat, solvents, deodorizers, and bleach.2 These oils are high in omega-6 polyunsaturated fatty acids (PUFAs), which are less stable when heated.3 Finally, there are concerns that consuming foods very high in omega-6 fatty acids is at odds with our evolutionary diet, potentially leading to negative health effects (though this is controversial).4

Although there isn’t convincing data to show industrial seed oils are detrimental to our health, the evolutionary and mechanistic concerns are enough for us to recommend mostly sticking to the less processed, more natural oils and fats.

Read more in our guide — Vegetable oils: are they healthy?

Trans fats: avoid
Hydrogenated anything
Interesterified oils
Partially hydrogenated anything
Vegetable shortening (like Crisco)
Highly processed vegetable oils: minimize
Rice bran
Unfortunately, refined vegetable oils are in so many products, you may struggle to find certain items (like salad dressing) that do not contain them. For homemade versions of sauces of all sorts, check out our sauces and dressings recipes— they’re really easy and delicious.

Note that for avoiding trans fat, the ingredient list is a better guide than the nutrition facts label. Artificial trans fats may be present in small amounts, up to 0.49 grams per serving, and the nutrition facts label will still show 0 grams trans fat. Small amounts can add up, especially when serving sizes are small, so check the ingredients before assuming a product is trans fat free.

And you probably don’t need to worry about the small amounts of naturally occurring trans fats in whole foods like meat and butter.5 It is the artificial trans fats that we need to avoid.

Read more about fats in our guide — Healthy fats on a keto or low-carb diet. And while you are at it, why not check out our guide to eating more of the right kinds of fat — The top 10 ways to eat more fat.

4. Minimize sugar replacements


There are three types of very low calorie sugar replacements that you might find in packaged foods: sugar alcohols, artificial sweeteners, and natural sweeteners. There are pros and cons to each of these additives. We recommend that you minimize or avoid them if possible; for more on why, check out our guide, Low-carb sweeteners: the best and the worst.

Here are the names of sugar replacements you might see on an ingredient list:

Sugar alcohols—
Artificial sweetners—
Acesulfame K
Alitame (Aclame)
Aspartame (NutraSweet)
Cyclamate (Sucaryl)
Saccharin (Sweet ‘N Low)
Sucralose (Splenda)
Natural extracts—
Monk Fruit (Luo Han Gul)

Want more information about the differences among these sugar replacements? Then check out this detailed listing with helpful information on dozens of products.

That’s it! Now you have better awareness of the names of ingredients that may not fit your low-carb lifestyle. Print this list and take it along so you can hit the grocery aisles with resolve and confidence!

Did you enjoy this guide?

We hope so. We want to take this opportunity to mention that Diet Doctor takes no money from ads, industry or product sales. Our revenues come solely from members who want to support our purpose of empowering people everywhere to dramatically improve their health.

Will you consider joining us as a member as we pursue our mission to make low carb simple?



There are two companion guides with more information about navigating the grocery store and deciphering food labels. They are:

Keto diet foods — top three mistakes at the grocery store
How to use the nutrition facts label

In addition, click through to our main keto foods guide, or our keto diet food list for real-food inspired grocery shopping!

For more basics, check out our simple but thorough beginner’s guide to the keto diet:

Ketogenic Diets for Beginners


About the author

Jenni Calihan created the non-profit, Eat the Butter, to start a mother-to-mother conversation about diet and health. She advocates for real-food-more-fat eating, and has been feeding her family (four kids) for twenty years.

Practical low-carb guides



  1. Trans fats have been shown to raise LDL cholesterol, lower HDL cholesterol, and increase inflammatory markers:

    The New England Journal of Medicine 1990: Effect of dietary trans fatty acids on high-density and low-density lipoprotein cholesterol levels in healthy subjects [randomized trial; moderate evidence]

    Lipids 2010: Effects of partially hydrogenated, semi-saturated, and high oleate vegetable oils on inflammatory markers and lipids [randomized trial; moderate evidence]

  2. Chemical Engineering Transactions 2017: Recovery of vegetable oil from spent bleaching earth: state of-the-art and prospect for process intensification [overview article; ungraded]

  3. Heating polyunsaturated fats to high temperatures makes them more likely to react with oxygen, leading to the formation of potentially harmful byproducts:

    Food and Nutrition Research 2011: Determination of lipid oxidation products in vegetable oils and marine omega-3 supplements [mechanistic study; ungraded]

    Journal of the American Oil Chemists’ Society 2002: Formation of 4-hydroxynonenal, a toxic aldehyde, in soybean oil at frying temperature [mechanistic study; ungraded]

  4. The American Journal of Clinical Nutrition 2005: Origins and evolution of the Western diet: health implications for the 21st century [overview article; ungraded]

  5. Although most of the data is from lower-quality studies and results from human trials have been mixed, natural trans fats don’t seem to raise risk factors for heart disease or other health problems:

    Advances in Nutrition 2011: Effects of ruminant trans fatty acids on cardiovascular disease and cancer: a comprehensive review of epidemiological, clinical, and mechanistic studies [very weak evidence]


  1. Dorte
    You’d be surprised to find that neither beef, pork or poultry sold at the supermarkets is what you call “Real Food” Industry still manages to add through injection chemicals like sodium phosphates, dextrose, sugars, carrageenan, etc. I worked for 25+ years in the industry and know what’s adeed.
  2. Joaney Malone


  3. Rayma
    Joaney, almost at the end of the article in blue. “Print this list.” It will open a different page with everything in list form.
  4. Amanda
    My keto pills and elegant cleanse diet and elegant garcinia diet pills came in today. The instructions say to take 2 a day, so I take 2 of each all at once every day, or is that over- doing it?
    Reply: #5
  5. Kristin Parker Team Diet Doctor
    Neither of those are necessary or recommended. Keto/lchf is all about restoring health through eating whole foods with good ingredients.
  6. Paula
    What about onion and garlic, used as flavorings? Do I need to avoid them?
    Reply: #7
  7. Kristin Parker Team Diet Doctor
    No, they are frequent additions to keto recipes!
  8. Antonio
    Why are you listing stevia as something to avoid? As for oils, what do you recommend to cook with other than coconut oil?
  9. Kristin Parker Team Diet Doctor
    We included a link where you can read more about our recommendation on stevia.

    And also one about the fats to use! Check out point 3.

  10. Gillian
    Time to recognise home fermented foods and beverages. Homemade milk kefir; % of lactose after fermentation 99% reduction. Please assist those who find these whole food fermenters to work them into their keto way of eating. TIA
  11. Ingrid
    We just purchased a quarter cow from a grass fed beef ranch. Since I know the owners, I know I'm getting fresh.
  12. valorie
    Is it safe to use a little corn extract?
    Reply: #13
  13. Kristin Parker Team Diet Doctor

    Is it safe to use a little corn extract?

    It depends on the other ingredients, but flavor extracts in general are safe for keto.

  14. Ásgerður
    Is it safe to drink almond milk?
    Reply: #15
  15. Kristin Parker Team Diet Doctor

    Is it safe to drink almond milk?

    Generally yes, as long as it's unsweetened. Make sure to read ingredient labels to make sure there aren't any undesirable ingredients.

  16. Alexis
    I am having a difficult time here in Ireland and trying to stay on keto however the nutritional labels seems very deceiving they are showing peanuts as having more fibre than carbs and I have asked for advice on reading the label but I do not understand
    Reply: #17
  17. Kristin Parker Team Diet Doctor

    I am having a difficult time here in Ireland and trying to stay on keto however the nutritional labels seems very deceiving they are showing peanuts as having more fibre than carbs and I have asked for advice on reading the label but I do not understand

    In Ireland, the fiber is showed separately from the carbs. Just go with what is on the carbohydrate line as we would subtract the fiber out anyway.

  18. Ade
    Is sucralose safe to keto? Because I used to drink the famous energy drink call “bang” ..... and I see this ingredient... also zero coke has it as well
    Reply: #19
  19. Kristin Parker Team Diet Doctor

    Is sucralose safe to keto? Because I used to drink the famous energy drink call “bang” ..... and I see this ingredient... also zero coke has it as well

    Sucralose is an artificial sweetener that we recommend avoiding. It is listed in the Sweeteners section above, which also has a link to our full guide on sweeteners.

  20. Lisa
    I have severe asthma and all artificial sweeteners bother me as well as Stevia. Do you know of an alternative sweetener I could use?
  21. Bean Hall
    Lisa have you tried monk fruit?
  22. 1 comment removed
  23. Jojo C
    How about Tapioca “fiber”, I’m having a hard time finding EB research on this. Any clues?
  24. orenda jones
    its so hard to find food that has no sugar in it.. I havent seen anything less then 2g..
    help if anyone has any advice .. i mean how much sugar are we allowed to have?
    Reply: #25
  25. Kristin Parker Team Diet Doctor

    its so hard to find food that has no sugar in it.. I havent seen anything less then 2g..
    help if anyone has any advice .. i mean how much sugar are we allowed to have?

    If there is not sugar as an ingredient on the label and those are naturally occurring sugars, then just keep an eye on the carb count.

  26. Bonnie
    So many good questions!
    I just want to clarify it totally to myself.. so if I buy a natural Greek yoghurt or sour cream or protein powder etc. and it has a very small amount of sugar per serving and no artificial sweeteners mentioned in the ingredients list, this is ok to eat? As long as the carbs are not exceeding my daily intake?? Thank you!
  27. Dee
    The vitamins that I am considering has cellulose. Is that ok for Keto?
  28. Susy
    I check the nutritional facts chart for plain (no sugar or artificial sweeteners added) carob syrup and it seems ok for low carb diet, with moderation of course, it's natural and taste delicious, why then is on your "not to eat" list? also, what are your recommendations on yacon syrup?
    Reply: #29
  29. Kristin Parker Team Diet Doctor

    I check the nutritional facts chart for plain (no sugar or artificial sweeteners added) carob syrup and it seems ok for low carb diet, with moderation of course, it's natural and taste delicious, why then is on your "not to eat" list? also, what are your recommendations on yacon syrup?

    You can see our full sweetener guide here.

  30. Eden
    How about the amaranth leaves, A. dubius?
  31. 1 comment removed
  32. Jana
    Thank You for knowledge spread! I am new here, so excuse me if I missed the answer to the question I have. There are many canned Coconut milks on the market with added ingredients such as "stabilizer: sodium carboxymethyl cellulose; emulsifier: polysorbate 60" I am 31 years old, being on low carb 12+ years now, last 2 years I am on keto. Recently I introduced Coconut creme in my diet because I do not eat dairy since I was born (but I do eat meat!) and here in the Mediterranean we rarely have coconut products. That is why I lack the information. Thank You in advance!
  33. Charlotte Ramirez
    Do you avoid supplements that have rice flour?
    Reply: #34
  34. Kristin Parker Team Diet Doctor

    Do you avoid supplements that have rice flour?

    Generally speaking, if possible, yes it would be preferable to find an option without the rice flour but for some supplements or medications that may not be possible. If it's something your doctor has recommended, you can ask them or a pharmacist for options that don't have it.

  35. family11
    What about peas, beans and chickpeas?
    Reply: #36
  36. Kristin Parker Team Diet Doctor

    What about peas, beans and chickpeas?

    They are generally too high carb for keto.

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