Winter Squash

Also indexed as: Acorn Squash, Buttercup Squash, Butternut Squash, Calabaza Squash, Cushaw Squash, Delicata Squash, Golden Nugget Squash, Hubbard Squash, Kabocha Squash, Spaghetti Squash, Turban Squash, Vegetable Marrow Squash

Winter squash is best baked, but it can also be steamed or boiled.

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These hardy vegetables are neither grown nor harvested in the winter, as the name seems to imply—they grow on frost-tender vines and are actually picked in the fall and stored until spring. Because of their hard, thick skins, they have the ability to keep through the cold winter months, a quality that made this member of the gourd family a staple vegetable before the days of modern shipping and freezing techniques. Under their hard skins, winter squash have large seeds and firm, deep-yellow or orange flesh.

Varieties

The most common varieties of winter squash include acorn, buttercup, butternut, hubbard, pumpkin, spaghetti, and turban. Other varieties include calabaza, cushaw, delicata, golden nugget, kabocha, and vegetable marrow.

Buying and storing tips

Winter squash can be found in the produce section of health food stores and supermarkets. Choose heavy squash with a smooth, hard, richly colored rind. Look for pre-cut pieces of large squash, such as the hubbard. Store winter squash for up to a week in a paper bag in the refrigerator, or in a cool, dry place for several weeks. Don’t store winter squash in plastic bags, because the plastic traps moisture and encourages spoilage and rot.

Availability

Winter squash is available all year long and is at its peak from early fall through the winter.

Preparation, uses, and tips

Wash the exterior of the squash just before using. Winter squash is best baked, but it can also be steamed or boiled. Cut butternut, acorn, or other winter squash in half lengthwise, scoop out and discard the seeds, and place squash halves, flesh-side-down, in a baking dish. Add 1/4-inch (0.6cm) of hot water, cover, and bake until tender. Scoop out flesh and purée with garlic, basil, and olive oil or butter. Winter squash can also be stuffed with seasoned bread cubes and seafood or cheese mixtures.

Nutritional Highlights

Winter squash, 1 squash (raw, acorn)
Calories: 172
Protein: 3.4g
Carbohydrate: 44.9g
Total Fat: 0.43g
Fiber: 6.46g
*Excellent source of: Magnesium (138mg), Potassium (1,495mg), Vitamin C (47mg), and Vitamin A (1,454 IU)
*Good source of: Calcium (142mg)

*Foods that are an “excellent source” of a particular nutrient provide 20% or more of the Recommended Daily Value. Foods that are a “good source” of a particular nutrient provide between 10 and 20% of the Recommended Daily Value.

Health benefits and concerns

Asthma

Vitamin C, present in fruits and vegetables, is a powerful antioxidant and anti-inflammatory. This anti-inflammatory activity may influence the development of asthma symptoms. A large preliminary study has shown that young children with asthma experience significantly less wheezing if they eat a diet high in fruits rich in vitamin C.

Athletic performance

Carbohydrate food is the most efficient fuel for energy production and can also be stored as glycogen in muscle and liver, functioning as a readily available energy source for prolonged, strenuous exercise. For these reasons, carbohydrates may be the most important nutrient for sports performance. Depending on training intensity and duration, athletes require up to 4.5 grams of carbohydrates per day per pound of body weight or 60 to 70 percent of total dietary calories from carbohydrates, whichever is greater. Including starchy vegetables in the diet is one good way to obtain these carbohydrates.

Bruising

Many Americans eat insufficient amounts of foods containing vitamin C; the disease caused by vitamin C deficiency, scurvy, causes easy bruising. While very few people actually have scurvy, even minor deficiencies of vitamin C can increase the incidence of bruising. People who experience easy bruising may want to try eating more fruits and vegetables—common dietary sources of vitamin C.

Cancer

The strong association between increased intake of beta-carotene from food and a reduced risk of lung cancer does not necessarily mean that supplementation with natural beta-carotene supplements would reduce the risk of lung cancer. Dietary beta-carotene may be a marker for diets high in certain fruits and vegetables that contain other anticancer substances that may be responsible for the protective effects. Until more is known, some doctors advise smokers to avoid all forms of beta-carotene supplementation—even natural beta-carotene.

Capillary fragility

Eating plenty of flavonoid- and vitamin C-rich fruits and vegetables helps to support the structure of capillaries.

Cataracts

Some, but not all, studies have reported that eating more foods rich in beta-carotene or vitamin A was associated with a lower risk of cataracts. Synthetic beta-carotene supplementation has not been found to reduce the risk of cataract formation. It remains unclear whether natural beta-carotene from food or supplements would protect the eye or whether beta-carotene in food is merely a marker for other protective factors in fruits and vegetables high in beta-carotene.

High homocysteine

A controlled trial showed that eating a diet high in fruits and vegetables containing folic acid, beta-carotene, and vitamin C effectively lowered homocysteine levels. Healthy people were assigned to either a diet containing a pound of fruits and vegetables per day, or to a diet containing 3 1/2 ounces (99g) of fruits and vegetables per day. After four weeks, those eating the higher amount of fruits and vegetables had an 11 percent lower homocysteine level compared to those eating the lower amount of fruits and vegetables.

Kidney stones

Potassium reduces urinary calcium excretion, and people who eat high amounts of dietary potassium appear to be at low risk of forming kidney stones. The best way to increase potassium is to eat fruits and vegetables. The level of potassium in food is much higher than the small amounts found in supplements.

Macular degeneration

People who eat plenty of fruits and vegetables high in beta-carotene appear to be at lower risk for macular degeneration than people who do not eat these foods. However, another study found no association between age-related macular degeneration and intake of antioxidants, either from the diet, from supplements, or from both combined. More research is needed to reconcile these differences. In the meantime, beta-carotene-rich vegetables continue to be part of a healthful diet.

Multiple sclerosis (MS)

In one survey, researchers gathered information from nearly 400 people (half with MS) over three years. They found that consumption of vegetable protein, fruit juice, and foods rich in vitamin C, thiamine, riboflavin, calcium, and potassium correlated with a decreased MS risk.

Night blindness

Low intake of fruits and vegetables containing beta-carotene, which the body can convert into vitamin A, may contribute to a vitamin A deficiency.

Pap smear

Most dietary studies have found that women receiving high amounts of nutrients from fruits and vegetables have less risk of cervical dysplasia. Protective effects may be especially strong from diets high in dark yellow and orange vegetables (carrots, winter squash, etc.) and tomatoes.

Pregnancy

Pregnant women should consume 1,500mg of calcium per day. Food sources of calcium include milk products, dark green leafy vegetables, tofu, sardines (canned with edible bones), salmon (canned with edible bones), peas, and beans.

Stroke

Researchers have found an association between diets low in potassium and increased risk of stroke. However, the association of increasing dietary potassium intake and decreasing stroke mortality only occurred in black men and hypertensive men in one study. Others have found an association between increased risk of stroke and the combination of low dietary potassium plus high salt intake. Increasing dietary potassium has lowered blood pressure in humans, which by itself should reduce the risk of stroke; however, some of the protective effect of potassium appears to extend beyond its ability to lower blood pressure. Maintaining a high potassium intake is best achieved by eating fruits and vegetables.

Diets high in fruit and/or vegetables are associated with a reduced risk of stroke, according to most studies. In a large preliminary study, cruciferous and green leafy vegetables, conferred the highest degree of protection. Because it is not clear which components of fruits and vegetables are most responsible for the protective effect against stroke, people wishing to reduce their risk of stroke should rely primarily on eating more fruits and vegetables themselves rather than taking supplements.

Health benefits and concerns for vegetables
Many health benefits and concerns associated with this food are applicable to other vegetables. Read about health benefits and concerns for vegetables for a full description.

The information presented in this website is for informational purposes only and was created by a team of U.S. registered dietitians and food experts. Consult your doctor, practitioner, and/or pharmacist for any health problem and before using any supplements, making dietary changes, or before making any changes in prescribed medications.