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Low calorie snacks are foods that deliver few calories for a satisfying amount of food, usually because they are mostly water, fiber or lean protein. In USDA data, a cup of strawberries has about 46 calories, two celery stalks about 11, a cup of cherry tomatoes about 27 and three cups of air-popped popcorn about 93, while a hard-boiled egg comes in at about 78. The common thread is low energy density: few calories per gram. Below is a USDA comparison table, what “low calorie” means on a food label, easy 100-calorie portions and what satiety studies found.
Peptide Labs does not sell snack foods. This article is general nutrition information, not medical advice, and it does not set calorie targets; those depend on the person and should be discussed with a clinician or dietitian.
Key Takeaways
- Fruits and vegetables top the list because they are about 80 to 95% water by weight in USDA data.
- On a US label, "low calorie" means 40 calories or fewer per standard serving, and "calorie free" means fewer than 5.
- Three cups of air-popped popcorn, a medium apple or a cup of grapes each land near 100 calories.
- Raspberries stand out with about 8 grams of fiber per cup for 64 calories.
- Adding protein, such as Greek yogurt or an egg, makes a low-calorie snack more filling for many people.
Low calorie snacks compared: USDA calories per serving
Values come from USDA FoodData Central SR Legacy entries (FDC numbers in brackets) at common serving sizes. Water is the share of the food’s weight, which explains much of why these foods are so low in calories.
| Snack (USDA entry) | Serving | Calories | Fiber | Protein | Water by weight |
|---|---|---|---|---|---|
| Celery (169988) | 2 medium stalks | 11 | 1.3 g | 0.6 g | 95% |
| Cucumber with peel (168409) | 1 cup slices | 16 | 0.5 g | 0.7 g | 95% |
| Red bell pepper (170108) | 1 cup sliced | 24 | 1.9 g | 0.9 g | 92% |
| Cherry tomatoes (170457) | 1 cup | 27 | 1.8 g | 1.3 g | 95% |
| Baby carrots (168568) | About 3 oz (85 g) | 30 | 2.5 g | 0.5 g | 90% |
| Strawberries (167762) | 1 cup | 46 | 2.9 g | 1.0 g | 91% |
| Watermelon (167765) | 1 cup diced | 46 | 0.6 g | 0.9 g | 92% |
| Orange (169097) | 1 fruit | 62 | 3.1 g | 1.2 g | 87% |
| Raspberries (167755) | 1 cup | 64 | 8.0 g | 1.5 g | 86% |
| Egg, hard-boiled (173424) | 1 large | 78 | 0 g | 6.3 g | 75% |
| Blueberries (171711) | 1 cup | 84 | 3.6 g | 1.1 g | 84% |
| Popcorn, air-popped (167959) | 3 cups | 93 | 3.5 g | 3.1 g | 3% |
| Apple with skin (171688) | 1 medium | 95 | 4.4 g | 0.5 g | 86% |
| Greek yogurt, plain, nonfat (170894) | 1 container (170 g) | 100 | 0 g | 17.3 g | 85% |
Popcorn is the outlier: it is dry, so gram for gram it is not low in calories, but air-popped kernels puff up so much that a large bowl weighs little. That is why serving size, not just the food, decides the calorie count. The fiber column matters too; fiber adds bulk and is a nutrient most Americans fall short on (see our guides to high fiber foods and daily fiber).
What "low calorie" means on a food label
Packaged foods can only use calorie wording that meets FDA definitions in 21 CFR 101.60. Knowing them helps you read the front of a box:
- “Calorie free” or “zero calories”: fewer than 5 calories per standard serving.
- “Low calorie”: 40 calories or fewer per standard serving, with an extra per-weight test for foods with small serving sizes.
- Naturally low foods: if a food is low in calories without being reformulated, the claim must apply to all foods of its type. FDA’s own example is “celery, a low calorie food.”
Wording such as “light,” “skinny” or “guilt-free” is often marketing rather than a defined low-calorie claim, so the Nutrition Facts panel is the place to check. Foods marketed as having negative or near-zero calories are covered in our article on negative calorie foods.
100 calorie snacks: portion examples
Many 100 calorie snacks are simply single portions of whole foods. Based on the USDA values above, each of these lands close to 100 calories:
- A medium apple (about 95) or a medium pear (about 101).
- Three cups of air-popped popcorn (about 93), before any butter or oil.
- A cup of grapes (about 104) or a cup of blueberries (about 84).
- A container of plain nonfat Greek yogurt (about 100).
- Half a cup of prepared edamame (about 94), which also brings about 9 grams of protein.
- A hard-boiled egg plus a cup of cherry tomatoes (about 105 together).
Pre-portioned packs can help too. In a 2022 study of 30 adults eating freely at home (Reister and Leidy, Current Developments in Nutrition), snacks supplied in larger packages raised snack intake by about 12% compared with standard packages, while offering more variety nudged people toward fruits and vegetables. Package size is a cue, not a rule, but measuring a portion into a bowl removes the guesswork.
What satiety studies found
Low-calorie snacks only help if they are satisfying enough that you are not hungry again soon. Two often-cited studies tested this directly:
- Whole fruit (Flood-Obbagy and Rolls, Appetite, 2009): 58 adults ate a whole apple, applesauce or apple juice matched for weight and calories before lunch. The whole apple increased fullness more than applesauce or juice and reduced total lunch calories, snack included, by about 15% compared with no snack. Adding fiber to juice did not match the whole fruit.
- Popcorn vs chips (Nguyen and colleagues, Nutrition Journal, 2012): 35 adults reported less hunger and more satisfaction after 6 cups of popcorn (100 calories) than after 1 cup of potato chips (150 calories). The study was funded by ConAgra Foods, a popcorn maker, and one author worked there.
Both were short, single-meal experiments in healthy adults, so they show effects on appetite over hours, not changes in weight. Hunger is also driven by hormones, sleep and habits (see our guide to hunger hormones). Still, the pattern fits a simple idea: whole, bulky foods tend to fill you up more than the same calories in liquid or dense form.
High protein low calorie snacks
Fruit and vegetables are low in calories but also low in protein, which is why some people find them less lasting on their own. High protein low calorie snacks combine both traits: plain nonfat Greek yogurt (about 17 grams of protein for 100 calories), canned light tuna (about 16.5 grams for 73 calories per 3 ounces), a hard-boiled egg and edamame. Pairing one of these with a fruit or vegetable is an easy way to build healthy low calorie snacks with protein and fiber. Our sibling guide to high protein snacks compares more options by protein per calorie.
Sweet low-calorie options
For a sweet craving, berries, an orange or frozen grapes cover it with fiber and water. Many “sugar-free” packaged snacks rely on sugar alcohols, which add fewer calories but can upset the stomach in larger amounts (see our guide to sugar alcohols). Our article on how to stop sugar cravings covers habits that help.
Watch-outs
- Sodium: pickles are almost calorie-free, but one small dill pickle spear has about 283 milligrams of sodium, roughly 12% of the Daily Value.
- Toppings: butter, oil, cheese powders and dips can multiply the calories in popcorn or vegetables. Measure them or choose lighter options such as salsa or plain yogurt dips.
- Too little food: people with small appetites, including many on GLP-1 medicines, may need nutrient-dense snacks rather than the lowest-calorie ones; see our GLP-1 diet guide and our article on calorie-dense foods.
- Relationship with food: if counting calories starts to feel stressful or compulsive, talk to a clinician or registered dietitian.
Frequently Asked Questions
What are the lowest calorie snacks?
In USDA data, celery, cucumber, bell pepper, cherry tomatoes and baby carrots each have about 30 calories or fewer per serving because they are mostly water.
What does low calorie mean on a label?
Under FDA rules, low calorie means 40 calories or fewer per standard serving. Calorie free means fewer than 5.
What are some 100 calorie snacks?
A medium apple, three cups of air-popped popcorn, a cup of grapes, a container of plain nonfat Greek yogurt or half a cup of edamame are each close to 100 calories.
Is popcorn a low calorie snack?
Air-popped popcorn has about 93 calories for three cups in USDA data. Butter, oil and flavored coatings add calories quickly.
What are high protein low calorie snacks?
Plain nonfat Greek yogurt, canned light tuna, hard-boiled eggs and edamame give the most protein for their calories.
Are low calorie snacks filling?
Studies suggest whole, bulky foods such as apples and popcorn are more filling than the same calories in juice or chips, though results come from short studies.
Questions about a label? Contact us or read our Buyer’s Guide. Food comes first; follow the label and ask a healthcare provider before starting a supplement, especially if you take medicines, are pregnant or have a food allergy. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Last reviewed October 2026.
Related guides: Negative Calorie Foods: The Myth, the Math and the Low-Calorie Foods That Help, High Protein Snacks: USDA Protein per Serving and What Studies Found, High Fiber Foods: USDA List of Fruits, Vegetables, Beans and Grains.