Yellow squash is one of the most nutritious low-calorie vegetables you can eat. A medium yellow squash has just around 40 calories while delivering 37 mg of vitamin C, meaningful amounts of vitamins A and B, potassium, and a high water content that keeps you hydrated. Whether you’re managing your weight, looking for blood sugar-friendly foods, or just trying to eat more vegetables, yellow squash checks a lot of boxes.
Nutrition in a Single Squash
One medium yellow squash (about 196 grams) provides 37 mg of vitamin C, which covers a significant chunk of the daily recommendation for most adults. It also contains vitamin A, B vitamins, and potassium at 162 mg per serving. The calorie count is remarkably low: a cup of raw summer squash has only about 20 calories, making it one of the lightest vegetables in the produce aisle.
Yellow squash also sits in the “very low oxalate” category, with just 1 mg per half cup. That’s good news if you’ve dealt with kidney stones and need to watch oxalate intake. Many other vegetables land much higher on that scale.
Why It’s Great for Weight Management
Yellow squash is 95 percent water by weight, putting it in the same league as cucumbers. That water content, combined with fiber and almost no calories, means you can eat a generous portion without making a dent in your daily calorie budget. Swapping yellow squash into pasta dishes, stir-fries, or casseroles adds volume and texture while cutting overall calories significantly. Many people spiralize it as a noodle substitute for exactly this reason.
Skin, Eye, and Immune Support
The yellow-orange pigment in yellow squash comes from beta-carotene, the same compound that gives carrots their color. Your body converts beta-carotene into vitamin A, which supports your immune system and vision. Both beta-carotene and vitamin C contribute to skin health. Vitamin C plays a direct role in collagen production, wound healing, and may help prevent wrinkles over time.
Yellow squash also contains lutein and zeaxanthin, two pigments that concentrate in the retina and help protect against age-related eye damage. Cooked summer squash varieties provide roughly 745 micrograms of these compounds per cup. That’s not the highest source available (leafy greens like spinach and kale contain much more), but it adds up as part of a varied diet, especially if you eat squash regularly during summer months.
Heart and Blood Sugar Benefits
With 162 mg of potassium per serving, yellow squash falls just below the threshold for a “high-potassium” food (200 mg). Potassium helps balance sodium in your body and supports healthy blood pressure. You won’t get your entire daily potassium from squash alone, but it contributes alongside other potassium-rich foods like bananas, potatoes, and beans.
Yellow squash is naturally very low in carbohydrates and sugar, which makes it a safe choice for people managing blood sugar. Its high water and fiber content slows digestion, preventing the kind of rapid blood sugar spike you’d get from starchier vegetables like corn or potatoes. For anyone on a low-carb or diabetes-friendly eating plan, yellow squash is one of the most versatile vegetables to work with.
How It Compares to Zucchini
Yellow squash and zucchini are close relatives, and nutritionally they’re nearly identical. Both are high in vitamins A, B, and C. Both are low in calories and rich in water. One cup of zucchini provides about 40 percent of the recommended daily intake of vitamin A, and yellow squash is in a similar range. The differences are mostly cosmetic and textural: yellow squash tends to be slightly sweeter with softer seeds, while zucchini has a firmer texture that holds up better in cooking. From a health standpoint, you can use them interchangeably.
Simple Ways to Eat More of It
Raw yellow squash works well sliced thin in salads or with dips. Sautéing it in olive oil with garlic takes about five minutes. Grilling brings out its natural sweetness. You can also roast it alongside other vegetables, blend it into soups, or bake it into frittatas. Because the flavor is mild, it absorbs whatever seasoning or sauce you pair it with.
One practical tip: don’t peel it. The skin is thin, fully edible, and contains additional fiber and nutrients. Smaller squash tend to be more tender with fewer seeds, so look for ones that are firm and no longer than about 8 inches. Larger yellow squash develop a spongier texture and more pronounced seeds, though they’re still perfectly fine to eat.