Keto diet foods — top three mistakes at the grocery store

It all starts at the grocery store. If you want to succeed on a keto diet, you have to know how to buy keto groceries. Follow this guide and you’re on your way to keto success.

Here are the top three mistakes people make when buying groceries on the keto diet – and how to avoid them.

 

1. Highly processed food

Mother and son organizing groceries

Even on a keto diet, it’s possible to end up buying unhealthy groceries. But not if you keep it real. Here’s how:

Buy whole food

Whole food has only one ingredient. Examples are meat, seafood, eggs, butter, oils, vegetables, fruit, and nuts.1 Such foods should form the foundation of your keto diet.2 And there are so many delicious choices!

Want a list? Print our keto food list and bring it when you go grocery shopping.

Limit packaged food

Most of the packaged food products you find in grocery stores are ultra-processed.3 Such products are often full of sugar and starch, and should be avoided on a keto diet.

Fortunately, it’s easy to avoid highly processed food. Here’s how:

Ignore the obvious

Sometimes the package speaks for itself. If it says anything like “cereal” or “cake” or “cookie” or “bread” or “pretzel” or “cracker” or “chip” — read no further. Walk away.4

Ignore low-carb products

If your store carries low-carb versions of pastas, breads and cookies, we generally recommend that you avoid them. They tend to be full of starch, artificial sweeteners, and other additives.5

Ignore “healthy” or “natural” labels

Many ultra-processed food-products are labeled “healthy” and/or “natural.” Ignore these meaningless terms. Disregard any health claim, including the AHA Heart-Check. Stick with single-ingredient, tasty keto foods as much as possible.

Buy minimally-processed packaged foods

Not all packaged foods are highly processed, but how do you know which to trust? The rule of thumb is to look for products with few ingredients.

Eggs, meat, and fish are great choices even though they are often packaged.6

Some minimally-processed real foods with few ingredients — like butter, cheese, coconut or olive oil, cream, nut butters, shredded veggies (like coleslaw), and sour cream — are packaged, but you can safely buy them.

Some slightly more processed foods, like no-sugar versions of beef jerky, hollandaise, pesto, pizza sauce, salad dressings, sausage, tahini, and tapenade may be okay too. Be sure to check the ingredient list and carb content to be sure, as carbs and additives vary among different brands.

2. Too many carbs

Close-up of the nutrition facts section

Now that you know how to avoid highly processed food, let’s fix the second keto grocery mistake: too many carbs.

For success on the keto diet, we recommend eating a maximum of 20 grams of net carbs per day.7

Here’s how to keep carbs from sneaking into your house:

Avoid carb creep

Carbs add up.

That portion of broccoli and carrots you had for dinner, the strawberries with whipped cream you had for dessert, and the nuts and dark chocolate you had in the evening — they all add up.

Even when eating healthy keto foods, “a little bit of this” and “a little bit of that” might take you out of ketosis. If you’re not getting results on your keto diet, consider the following grocery-shopping tips:

Buy fewer high-carb vegetables

Avoid stocking up on on high-carb vegetables. Check out our visual vegetable guide for the most keto-friendly options.

Our favorite keto vegetables are very low carb. Greens, asparagus, avocado and zucchini come to mind. Enjoy other delicious veggies like broccoli, cauliflower, green beans and brussels sprouts too of course, but be a bit more careful with these since they contain a few more carbs.

Buy less fruit

On the keto diet, your best bet is to avoid buying fruit and berries. If you want to eat them occasionally, check out our visual fruits and berries guide for the most keto friendly options.

Though no fruit is great for keto, strawberries, raspberries and blackberries are okay once in a while, especially if you keep your serving size small. Lemon and lime, in small amounts, work too (technically avocado and tomatoes are low sugar fruits, but for convenience we group them with vegetables).

Buy fewer nuts and less dark chocolate

Nuts and dark chocolate (85% cocoa minimum) are keto friendly in small amounts. The problem is that they are convenient and delicious, so it can be easy to overeat these treats and end up going over your daily carb limit.

Check out our visual nut guide for the best keto options (replace cashews with macadamia nuts or pecans, for example). Take a look at our keto snack guide to see the amount of carbs in different types of chocolate.

Another common slip-up is over-eating almond flour in baked items that are keto-friendly only when served in smaller quantities. So keep your eye on portion size and be mindful of how much almond flour you buy.

Buy less cream cheese and Greek yogurt

These full-fat dairy products can be okay in moderation, but both contain carbohydrates. Cream cheese has one or two grams of carbs per ounce (28 grams), and Greek yogurt has about 10 g of carbs per cup (240 grams). So go easy!

Calculate net carbs

Packaged foods often contain hidden sugars and starches.8 Avoid this trap by calculating the number of net carb the food contains.9

dark chocolate comparison

As an example, consider the label on the chocolate bar to the left – the Green & Black 85% Cacao Bar.

dark chocolate nutrition 1How do you calculate the number of net carbs in that chocolate? Do these four things (it takes just seconds once you’ve done it a few times):

1. Check the serving size

First, look at the serving size, (circled in red, above). How much chocolate is in one serving? A square? A cup? Half the package?

As you can see, the serving size for this chocolate is 40 grams, or 12 small squares.

2. Check carbs per serving

Second, check the total grams of carbohydrate per serving (circled in blue, above).

This chocolate has 14 grams of total carbs per serving.

3. Calculate net carbs per serving

Third, check the grams of dietary fiber per serving, (circled in green, above). Calculate net carbs by subtracting the fiber (green) from the total carbohydrates (blue). This chocolate has 9 g net carbs per serving (14 g carbs – 5 g fiber = 9 net carbs).

4. Calculate how many net carbs you will eat

Finally, multiply the number of servings you’ll eat by the net carbs per serving.

Let’s say you want to eat six small squares of chocolate (about half a serving, or 20 grams). That’s 4.5 grams of net carbs (0.5 serving * 9 g net carbs).

But if you were to eat the whole chocolate bar (2.5 servings), you would eat 22.5 grams of net carbs (2.5 servings * 9 net carbs) – more than an entire day’s worth of carbs on a keto diet.

This chocolate bar, when consumed in small amounts, is a keto approved treat, but buyer beware — it’s easy to overeat.

Let’s look at the nutrition facts label for another dark chocolate option, Salazon’s delicious Dark Chocolate with Sea Salt and Almonds:

dark chocolate nutrition 2

As you can see, this bar has 13 g of net carbs per serving.10 If you eat a half serving (in this case, ¼ of the bar, or 20 grams), you would consume 6.5 g of net carbs. This treat does not meet the net carb goal for most keto lifestyles. After a look at the nutrition facts label and a quick calculation of net carbs, you will know to put this bar back on the shelf.

For more information about the nutrition facts label, please check out our guide on how to use the nutrition facts label.

3.Potentially unhealthy ingredients

Sugar ingredients

Almost all packaged foods include an ingredient list. Always check it before buying something new.

For keto success, avoid or limit the big four:

These foods are potentially unhealthy because of their impact on blood sugar:

  1. Sugar
  2. Grains
  3. Sweeteners

These foods are refined, industrial products, with negative or unclear health effects:

  1. Trans fats (negative health impact)
  2. Highly processed vegetable oils (unclear health impact)

Avoid sugar

When making keto selections, it is key to avoid sugar in all its forms. Manufacturers sometimes come up with odd names to disguise sugar on their labels. In general, avoid:

  • Any kind of sugar, syrup, malt or cane product;
  • Any chemical ending with ‘ose’ (like lactose); and
  • All naturally sugary ingredients like honey, fruit juice concentrates and dried fruit.

For a detailed list of the dozens of possible names for sugar, click through to our guide, Ingredients to avoid, or print this cheat sheet to take with you to the market.

Avoid grains

Most of the starch in our diets come from grains. Wheat and corn are the main ones, but any kind of grain, and any sort of flour except nut flours, can add lots of carbohydrates to a food product. These sorts of products can spell trouble for keto eaters.

For a list of all the different names for wheat, grains, and other starchy additives, click through to our guide, Ingredients to avoid.

Avoid artificial sweeteners and other chemicals

Sweeteners may potentially stall weight loss and prolong sugar addiction.11 Our recommendation is to eliminate them from your keto diet and help banish sugar cravings for good.

Avoid:

  • Chemical sweeteners like sucralose (Splenda) and aspartame (Nutrasweet).

Click through for a more detailed list of artificial sweeteners.

Avoid trans fats and limit highly-processed vegetable oils

Although keto emphasizes fat, not all fats are created equal. Put natural fats in your cart and stay away from altered and industrially extracted fats.

  • Avoid industrial trans fats — anything partially hydrogenated or any ingredient like margarine or shortening. Research suggests that these fats may have negative effects on heart health.12 Fortunately, trans fats are banned in Europe and will be completely eliminated from the US food supply by 2021.
  • Limit highly-processed vegetable seed oils — canola, corn, cottonseed, grapeseed, safflower, and soybean oils. We recommend limiting these oils because they are highly processed and rich in omega-6 fatty acids. Although both omega-6 and omega-3 fats are essential, meaning we must get them from food, most diets today may provide far more omega-6 than we need.13 Additionally, the health effects of vegetable oils are still unclear.

    Learn more in our guide, Vegetable oils: are they healthy?

4. Summary

Couple shopping in supermarket.

Avoid all of the classic grocery cart mistakes— highly processed food, too many carbs and potentially unhealthy ingredients — and put keto success within reach. With a little practice, it’s easy to load up your cart with a delicious selection of whole, full-fat food… and minimally processed keto extras, too.

Now go forth and grocery shop, keto-style!

More

There are two companion guides with more information about ingredients to avoid, and how to decipher food labels:

Ingredients to avoid on a low-carb or keto diet
How to use the nutrition facts label

 

In addition, check out our main keto foods guide below to understand the basics about keto foods, and our keto diet foods list, for fast and real-food inspired grocery shopping!

Ketogenic diet foods – what to eat and what to avoid
Keto diet food list – what to buy

For all the keto 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. Are you concerned about consuming butter, meat, and other foods that contain saturated fat? You probably don’t need to be. Although it’s still somewhat controversial and not all experts agree, several recent systematic reviews of randomized trials have failed to show a connection between eating saturated fat and increased heart disease risk:

    Open Heart 2016: Evidence from randomised controlled trials does not support current dietary fat guidelines: a systematic review and meta-analysis [strong evidence]

    Nutrition Journal 2017: The effect of replacing saturated fat with mostly n-6 polyunsaturated fat on coronary heart disease: a meta-analysis of randomised controlled trials
    [strong evidence]

    Learn more here: A user guide to saturated fat

  2. These are the foods that our ancestors consumed for thousands (quite possibly millions) of years:

    Annual Review of Nutrition 2014: Evolutionary adaptations to dietary changes [overview article; ungraded]

  3. In a recent analysis of over 230,000 food and beverage products sold in the US, 71% were considered ultra-processed:

    Nutrients 2019: The healthfulness of the US packaged food and beverage supply: a cross-sectional study [ingredient analysis study; ungraded]

  4. Since these foods are typically high in carbs, they are not a good choice on a keto diet.

  5. For instance, many low-carb sweets and bars contain sugar alcohols, which can be partially digested and absorbed into your bloodstream. The most common and worst offender is maltitol, which has a relatively high glycemic index of 35 and can raise blood sugar and insulin levels:

    Nutrition Research Reviews 2003: Health potential of polyols as sugar replacers, with emphasis on low glycaemic properties [overview article; ungraded evidence]

    European Journal of Clinical Nutrition 1994:: Digestion and absorption of sorbitol, maltitol and isomalt from the small bowel: a study in ileostomy subjects [randomized trial; moderate evidence]

    Gastroentérologie Clinique et Biologique 1991: Clinical tolerance, intestinal absorption, and energy value of four sugar alcohols taken on an empty stomach [randomized trial; moderate evidence]

  6. Don’t let eggs high cholesterol content worry you; eating eggs doesn’t seem to raise cholesterol levels very much in most people:

    Nutrients 2018: Dietary cholesterol contained in whole eggs Is not well absorbed and does not acutely affect plasma total cholesterol concentration in men and women: results from 2 randomized controlled crossover studies [moderate evidence]

    Nor should you fear meat, which provides a satisfying, high-quality source of protein. The evidence linking it to heart disease, cancer, and other health issues is very weak: Guide to red meat: is it healthy?

  7. Results from many clinical trials suggest that keeping carbs very low is very effective for losing fat and controlling blood sugar:

    Obesity Reviews 2016: Impact of low-carbohydrate diet on body composition: meta-analysis of randomized controlled studies. [strong evidence]

    Nutrition & Diabetes 2017 Twelve-month outcomes of a randomized trial of a moderate-carbohydrate versus very low-carbohydrate diet in overweight adults with type 2 diabetes mellitus or prediabetes [randomized trial; moderate evidence]

    Nutrition & Metabolism 2008: The effect of a low-carbohydrate, ketogenic diet versus a low-glycemic index diet on glycemic control in type 2 diabetes mellitus [randomized trial; moderate evidence]

  8. Sugar is added to many foods. In one review of more than 40,000 products at a large Canadian grocery retailer, 66% were found to contain at least one added sugar:

    Canadian Medical Association Journal Open 2017: Added sugar in the packaged foods and beverages available at a major Canadian retailer in 2015: a descriptive analysis [ingredient analysis study; ungraded]

  9. “Net carbs” are the carbs digested and absorbed by your body. Fiber isn’t counted as a net carb because your body isn’t able to digest and absorb it:

    Nutrients 2010: Effects of dietary fiber and its components on metabolic health [overview article; ungraded]

  10. Net carbs = sugar + starch (starch isn’t listed on nutrition facts labels). So this bar has 10 g sugar + 3 grams starch for a total of 13 g net carbs.

  11. In some people, artificial sweeteners appear to partially activate the “food reward” pathway responsible for cravings:

    The Yale Journal of Biology and Medicine 2010: Artificial sweeteners and the neurobiology of sugar cravings [overview article; ungraded]

    Physiology & Behavior 2016: Recent studies of the effects of sugars on brain systems involved in energy balance and reward; relevance to low calorie sweeteners Postprandial hypotension: a systematic review [overview article; ungraded]

  12. Consuming trans fats has 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]

  13. From the days of our earliest ancestors up until the past hundred years or so, it’s estimated that humans consumed omega-6 and omega-3 fats in a roughly 1:1 ratio. Today, that ratio is estimated to be around 16:1, on average:

    Biomedicine & Pharmacotherapy 2006: Evolutionary aspects of diet, the omega-6/omega-3 ratio and genetic variation: nutritional implications for chronic diseases [overview article; ungraded]