11 Lowest-Calorie Vegetables for Weight Loss (With Real Numbers)

Here’s the problem with most weight-loss advice: it asks you to eat less while feeling hungrier, which is exactly why it doesn’t stick. Low-calorie vegetables solve a different problem — they let you eat a genuinely large plate of food, feel full, and still land in a calorie deficit. I pulled the actual USDA numbers behind the vegetables people recommend most often, because a lot of the calorie counts floating around online are rounded, outdated, or just wrong. Here’s what the data really says, and how to use it.

Why Low-Calorie Vegetables Actually Move the Needle

Most low-calorie vegetables share two traits: they’re mostly water, and they’re high in fiber relative to their calorie count. Both slow down digestion and stretch your stomach, which triggers fullness signals the same way a much higher-calorie meal would. That’s the entire mechanism behind “volume eating,” an approach that’s gotten a lot of attention lately for a good reason — the logic holds up. As Cleveland Clinic’s breakdown of volume eating puts it, building meals around high-water, high-fiber foods lets you eat a genuinely large amount of food while keeping the calorie total low, which is a more sustainable path than just eating smaller portions of everything.

None of this means calories don’t count, or that vegetables are magic. A cup of raw spinach is 7 calories; a cup of oil-heavy sautéed spinach is a different food entirely. The vegetable matters less than what you do with it, so I’ve kept the numbers below to raw or simply prepared versions, with a note on cooked values where they matter.

The 11 Lowest-Calorie Vegetables (With Real Numbers)

All figures below are sourced from USDA FoodData Central entries via MyFoodData’s nutrition database, and they’re for raw vegetables unless I’ve noted otherwise.

Romaine Lettuce

One cup of shredded romaine is 8 calories. It’s mostly water and doesn’t carry much nutritionally on its own, which is exactly why it works well as bulk — a base you build a real meal on top of rather than a food you’re eating for its nutrient density. If you want more nutrition per bite, swap in or mix with a darker leaf like green leaf lettuce or spinach.

Spinach

Raw spinach comes in at 7 calories per cup; cooked and drained, a cup is closer to 41 calories, because a cup of cooked spinach represents a lot more actual spinach than a cup of the loose raw leaves. Either way it’s a good source of vitamin K and vitamin A, and it disappears into smoothies, sauces, soups, and pasta without changing the flavor much, which makes it one of the easiest vegetables to actually eat consistently.

Seaweed (Nori)

Dried nori sheets run about 9 calories for a stack of ten — close enough to negligible that it’s not really a “calories per cup” food the way leafy greens are. What it does bring is iodine, which most people don’t get enough of, plus a savory, umami flavor that works well crumbled over rice bowls, salads, or soup instead of salt.

Kale

Raw, chopped kale runs about 8 calories per cup, loosely packed — one of the lowest counts on this list, since a cup of it weighs very little. It’s dense in vitamin K, vitamin C, and vitamin A relative to its size, which is a big part of why it shows up in so many “superfood” lists. It holds up well in both salads and cooked dishes like soups or sautés, where cooking shrinks the volume dramatically, so keep an eye on portions once it’s cooked down.

Cabbage

A cup of raw shredded cabbage is about 22 calories. Red and green cabbage both carry solid amounts of vitamin K and vitamin C, and they hold up to just about any preparation — raw slaw, roasted wedges, or simmered into a soup like the one in my cabbage soup diet shopping list.

Cucumber

Cucumbers are over 90% water by weight, which is why a cup of sliced cucumber is only about 16 calories. They’re not a nutritional powerhouse, but they’re one of the easiest ways to add volume to a meal without adding calories — sliced into a salad, layered onto a sandwich, or just eaten plain when you want something to crunch on.

Eggplant

Raw, cubed eggplant is around 20 calories per cup; once it’s roasted, grilled, sautéed, or baked, that same cup is closer to 35 calories, since cooking concentrates it. It’s technically a fruit, but it’s used as a vegetable in practically every cuisine, and its fiber content may help with blood sugar regulation, which is worth knowing if you’re also watching those numbers.

Broccoli and Broccolini

Raw, chopped broccoli is about 31 calories per cup; steamed or boiled, that rises to roughly 55 calories per cup as it compacts down. It’s a strong source of vitamin C, folate, and vitamin K. Broccolini, the more slender, milder-tasting relative, runs a bit higher raw at about 37 calories per cup, with a similar nutrient profile plus a good amount of vitamin A. Both are worth having in rotation rather than picking one — they cook differently and work in different dishes.

Zucchini

A cup of raw, sliced zucchini is about 21 calories, and a whole medium zucchini comes to roughly 33 calories. It’s one of the most versatile vegetables in the kitchen — spiralized into noodles, roasted, grilled, or folded into baked goods — and its potassium and fiber content help support digestion and blood pressure.

Mushrooms

Raw portobello mushrooms run about 19 calories per cup, diced. They’re a solid source of B vitamins, copper, and potassium, and their meaty texture makes them a common meat substitute for vegetarians. One caveat worth knowing: most grocery-store mushrooms contain very little vitamin D unless they’re specifically labeled as UV-exposed — regular mushrooms grown without UV light have only trace amounts, while UV-treated ones can carry a meaningful dose, according to USDA research on mushroom vitamin D content. If vitamin D is why you’re buying mushrooms, check the label.

Winter Squash

Acorn squash and other winter squash varieties are rich in vitamin A, which supports eye health, and carry more potassium than a banana. A cup of raw, cubed acorn squash is about 56 calories; it holds up well as a soup base, and frozen cubed versions are a reasonable shortcut if you don’t want to deal with the skin.

Quick Reference: Calories Per Cup, Raw

If you just want the numbers without the detail, here’s the full list side by side:

• Romaine lettuce, shredded: 8 calories
• Spinach, raw: 7 calories (cooked and drained: ~41 calories)
• Nori (seaweed): ~9 calories per 10 sheets
• Kale, chopped: ~8 calories
• Cabbage, shredded: 22 calories
• Cucumber, sliced: 16 calories
• Eggplant, cubed: 20 calories raw (~35 calories cooked)
• Broccoli, chopped: 31 calories raw (~55 calories cooked)
• Broccolini, chopped: 37 calories
• Zucchini, sliced: 21 calories (one medium zucchini: ~33 calories)
• Mushrooms (portobello), diced: 19 calories
• Acorn squash, cubed: 56 calories

Notice how little separates most of these — the real calorie difference in your day almost never comes from picking cabbage over broccoli. It comes from what you pour on top of either one.

How to Actually Use This Without Getting Bored

A pile of plain vegetables gets old fast, and “eat more vegetables” advice fails for exactly that reason. What’s worked for me is picking one low-calorie vegetable to be the volume base of a meal — a big bowl of cabbage, zucchini, or broccoli — and then building real flavor around it with a protein source, a sauce with some fat in it, and something acidic like lemon or vinegar. The vegetable is doing the volume work; it doesn’t need to carry the flavor by itself.

If you’re managing blood sugar specifically, not every vegetable on a typical list is a safe default — I’ve written separately about which vegetables to limit if you’re diabetic, since a few starchy ones get lumped in with the low-calorie group when they shouldn’t be. And if a particular vegetable tends to leave you bloated or uncomfortable, it’s worth checking whether it’s one of the vegetables that are harder on digestion for some people — cruciferous vegetables like broccoli and cabbage are common culprits, not a sign you’re doing something wrong.

If you’d rather not plan this meal by meal, I built my 4-Week Weight Loss Planner to take that decision-making off your plate — it lays out daily targets and meal structure so you’re not reinventing a vegetable-forward plate from scratch every night.

Three Combinations That Actually Work

A ratio that holds up in practice: roughly two cups of a low-calorie vegetable, a palm-sized portion of protein, and a tablespoon of something fatty for flavor and satisfaction. A few versions of that I come back to often:

• Two cups of roasted broccoli and cabbage with a fried egg and a drizzle of tahini — comes in well under 400 calories for a plate that actually fills you up.
• A big cucumber-and-cabbage slaw with grilled chicken and a lemon-yogurt dressing instead of a heavy mayo-based one.
• Zucchini noodles with a protein-forward sauce (ground turkey, tomato, a little parmesan) instead of regular pasta, which cuts a few hundred calories without you missing the volume of a normal pasta bowl.

None of these require a special product or a strict recipe — the pattern is what matters, not the exact ingredients.

A Word on “Superfood” Hype

Every year a new vegetable gets crowned the thing that will transform your health, and kale, broccoli, and seaweed have all had their turn. The honest picture is less dramatic: no single vegetable is doing anything the others on this list aren’t also doing to some degree, which is getting a lot of nutrients and fiber into you for very few calories. Rotating through several of them beats loading up on one “superfood” and calling it done, both because your gut microbiome benefits from variety and because no one vegetable supplies everything you need. If you’re increasing your vegetable and fiber intake quickly, ease into it — a sudden jump can cause bloating, and I’ve written a full guide on adding fiber without the bloating if that’s happened to you. On the other end of that spectrum, if fiber-rich vegetables have left you backed up rather than bloated, my piece on the best soup for constipation covers what actually helps.

Frequently Asked Questions

Can I eat unlimited amounts of these vegetables and still lose weight?
Practically, yes, within reason — it’s genuinely hard to overeat calories on plain cucumber or spinach. Once you add oil, cheese, creamy dressings, or fried preparations, the math changes fast, so the vegetable itself isn’t the variable to watch as closely as what you’re cooking it in.

Are frozen vegetables as good as fresh?
Nutritionally, yes. Frozen vegetables are typically flash-frozen at peak ripeness, which can preserve nutrients as well as or better than fresh produce that’s traveled and sat on a shelf. They’re a reasonable, often cheaper way to keep low-calorie vegetables on hand without food waste.

Do vegetarians automatically eat more of these vegetables and end up healthier?
Not automatically — a vegetarian diet built around refined carbs and cheese isn’t inherently healthier than an omnivorous one built around vegetables and lean protein. I’ve gone deeper on this comparison in a piece on whether vegetarians are actually healthier than meat eaters.

What’s the easiest way to eat more of these if I don’t like plain vegetables?
Roasting is the easiest entry point for most people — high heat caramelizes the natural sugars in vegetables like broccoli, cabbage, and zucchini and makes them taste noticeably sweeter and less bitter than steamed or raw versions, with only a small calorie cost from the oil.