Food guide

Are Protein Bars Healthy? How to Pick the Healthiest Protein Bars

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Short answer

Some are better than others, but almost all of them are ultra-processed (NOVA 4). The protein usually comes from milk or pea protein isolates and the sweetness from sugar alcohols or sweeteners, so even a low-sugar bar is a factory food. Inside that group the labels still differ a lot. Of the protein bars we have scored, the Truvi score (our method) runs from 20 out of 100 for the Quest Hero Cookies & Cream to 61 for the IQ Bar Chocolate Sea Salt. The healthiest picks combine plenty of protein and fiber with little sugar and little saturated fat, and a short ingredient list that starts with real food.

Are protein bars healthy?

A protein bar is built to hit numbers on the front of the pack: lots of protein, little sugar. The usual way to get there is with ingredients you would not cook with at home. The researchers who created NOVA, the food-processing scale used in nutrition research, name whey protein, casein and protein isolates as typical markers of ultra-processed food, along with sweeteners such as stevia-derived compounds, flavors, emulsifiers and added fiber (Monteiro et al., 2019). Most protein bars contain several of these.

That matters because large reviews of the research link diets high in ultra-processed food with higher risks of heart disease deaths and type 2 diabetes (Lane et al., BMJ, 2024). Those studies are observational and look at the whole diet, not at one bar now and then. So the honest answer is that a protein bar is a convenient snack, not a health food, and some are clearly better made than others.

Low sugar and high protein do not change the processing. NOVA looks at how a food is made, not at its nutrients. A bar with 1 g of sugar can still be one of the most processed foods in your cart.

The bars we scored, from best to worst

Each card links to the full page with the label, the ingredients and how the score was worked out.

  • IQ Bar Chocolate Sea Salt, 61 out of 100. one 45 g bar has 180 calories, 12 g of protein, 8 g of fiber and about 1 g of sugar. Almonds come first on the label and there are no sugar alcohols. It is still NOVA 4 because of the pea protein crisps, natural flavors and stevia. Its weak spot is density: about 70% of its calories come from fat, so it is easy to eat a lot of calories quickly.
  • Kirkland Signature Cookies & Cream, 58 out of 100. one 60 g bar has 170 calories, 22 g of protein, 10 g of fiber, 2 g of sugar and 1.5 g of saturated fat. On nutrition alone it is the strongest bar here. The processing is what holds it back: milk and whey protein isolates, erythritol and stevia.
  • Larabar Peanut Butter Cookie, 44 out of 100. three ingredients (dates, peanuts, sea salt) and not ultra-processed (NOVA 3). But one 48 g bar has 16 g of sugar from the dates and only 6 g of protein. It is a fruit and nut bar, not a protein bar.
  • Quest Hero Cookies & Cream, 20 out of 100. one 52 g bar has 150 calories, 18 g of protein, 6 g of fiber and about 1 g of sugar. It also has 5 g of saturated fat, mostly from palm kernel oil, three sweeteners and a long list of additives, which puts it at the bottom.

How to pick the healthiest protein bar

You do not need a list of brands. Five checks on the back of the pack sort most bars.

  • Read the first ingredients. they are listed by weight. A bar that starts with nuts, seeds or dates is closer to real food than one that starts with a protein blend of isolates. In our set, the IQ Bar starts with almonds; the Quest and Kirkland bars start with milk protein isolate.
  • Look at saturated fat, not just sugar. the FDA uses a Daily Value of 20 g of saturated fat, and calls 20% of the Daily Value per serving high and 5% or less low. That puts 4 g of saturated fat at the high line. The Quest Hero has 5 g; the Kirkland bar has 1.5 g.
  • Check total and added sugar. the Daily Value for added sugars is 50 g. Most protein bars keep sugar near zero by using sweeteners instead, so a low sugar number tells you about the sweetener, not about how processed the bar is.
  • Count the sweeteners. many bars combine a sugar alcohol such as erythritol with stevia or sucralose. Fewer is simpler. If sugar alcohols upset your stomach, look for bars without them.
  • Compare protein and fiber per calorie. 22 g of protein and 10 g of fiber for 170 calories (Kirkland) is a very different snack from 6 g of protein for 220 calories (Larabar). The fiber Daily Value is 28 g.

Erythritol (E968)

The sugar alcohol in many low-sugar bars, including the Quest and Kirkland bars here. A 2023 study found that people with higher blood levels of erythritol had more heart attacks and strokes over the following three years (Witkowski et al., Nature Medicine, 2023). The people studied were patients already being checked for heart disease, and the study is observational: it shows a link, not proof that erythritol is the cause.

Why bars with similar nutrition get very different scores

The Truvi score (our method) is an opinion from the label. It blends three parts: how processed the food is, its nutritional quality (worked out the way Nutri-Score, the A to E grade used on packs in Europe, does it) and how easy it is to overeat.

  • Processing. every NOVA 4 bar scores low here. The Quest and Kirkland bars both get 21 out of 100, the IQ Bar 30. The Larabar, at NOVA 3, gets 56.
  • Nutrition. this is where the Kirkland bar pulls ahead with 85 (Nutri-Score A on our calculation), against 78 for the IQ Bar, 48 for the Larabar and 20 for the Quest Hero, which loses points for saturated fat and salt.
  • Overeating. researchers who built a numeric definition of hyper-palatable foods used markers such as more than 25% of calories from fat together with at least 0.3% sodium by weight, or more than 20% of calories from both fat and sugar (Fazzino et al., 2019). The Quest Hero (36% of calories from fat) and the IQ Bar meet the fat and salt marker, the Larabar meets the fat and sugar marker. The Kirkland bar meets none and scores 93 here.

So the two cookies and cream bars, which look alike on the front of the pack, end up 38 points apart: same processing, very different nutrition and fat.

Are there protein bars that are not ultra-processed?

A few. A bar made only from foods like nuts, seeds, dates and a little salt falls into NOVA group 3, processed food, and not group 4. Group 3 covers products made by adding salt, sugar or oil to whole foods (Monteiro et al., 2019). The Larabar is an example.

The trade-off is protein. Without isolates it is hard to reach the protein numbers on most protein bars, which is why the Larabar has 6 g and the isolate bars have 18 to 22 g. If you want a bar mainly for protein, the realistic choice is the best-made ultra-processed one: protein from a short list, low saturated fat, one sweetener, and real food near the top of the label.

Questions people ask

Are protein bars healthy?

They are a convenient snack, not a health food. Almost all are ultra-processed (NOVA 4), and diets high in ultra-processed food are linked to higher risks of heart disease deaths and type 2 diabetes in observational research. Some are much better made than others: the bars we scored range from 20 to 61 out of 100 on the Truvi score (our method).

Are all protein bars ultra-processed?

Most are, because their protein comes from isolates such as whey or pea protein and their sweetness from sugar alcohols or sweeteners. Bars made only from nuts, dates and seeds, like the Larabar, are NOVA 3 instead, but they have much less protein.

Are Quest bars ultra-processed?

Yes. The Quest Hero Cookies & Cream bar is NOVA 4: milk and whey protein isolates, allulose, erythritol and sucralose, palm kernel oil and carrageenan. It scores 20 out of 100, mainly for its processing, its 5 g of saturated fat and its salt.

What are the healthiest protein bars with low sugar?

Low sugar alone does not make a bar healthy, because most bars get there with sweeteners. Among the bars we scored, the IQ Bar Chocolate Sea Salt (about 1 g of sugar, 61 out of 100) and the Kirkland Signature Cookies & Cream (2 g of sugar, 58 out of 100) come out best.

What are the healthiest protein bars at Costco?

Of the bars we have scored, Costco's own Kirkland Signature Cookies & Cream bar does best on nutrition: 22 g of protein, 10 g of fiber, 2 g of sugar and 1.5 g of saturated fat for 170 calories. It is still ultra-processed and scores 58 out of 100.

What should I look for on a protein bar label?

Real food among the first ingredients, low saturated fat (under 20% of the Daily Value, which means under 4 g), little added sugar, as few sweeteners as possible, and a good amount of protein and fiber for the calories.

Sources

  1. Lane MM et al. Ultra-processed food exposure and adverse health outcomes: umbrella review of epidemiological meta-analyses. BMJ, 2024.
  2. Monteiro CA et al. Ultra-processed foods: what they are and how to identify them. Public Health Nutrition, 2019.
  3. U.S. Food and Drug Administration. The lows and highs of percent Daily Value on the Nutrition Facts label.
  4. U.S. Food and Drug Administration. Daily Value on the Nutrition and Supplement Facts labels.
  5. Witkowski M et al. The artificial sweetener erythritol and cardiovascular event risk. Nature Medicine, 2023.
  6. Fazzino TL, Rohde K, Sullivan DK. Hyper-palatable foods: development of a quantitative definition and application to the US food system database. Obesity, 2019.

Product scores are the Truvi score (our method, from the label). How the score works. Not medical advice.

Spotted a mistake? Email [email protected] and we will review it.

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