Barbie Cervoni MS, RD, CDCES, CDN, is a registered dietitian and certified diabetes care and also education specialist." data-inline-tooltip="true">Barbie Cervoni MS, RD, CDCES, CDN

Marisa Moore is a registered dietitian nutritionist with a BS in nutrition science and also MBA in marketing. She is also the founder the Marisa Moore Nutrition.

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Members that the lily family, onions room a highly aromatic vegetable offered in cuisines about the world. You may have actually heard rumors the onions come to be toxic ~ they're cut, or the onions space too starchy because that those on low-carbohydrate eating plans. However, this rumors are quickly dispelled after ~ reviewing the research on onions.

Onion Nutrition facts

The following nutrition information is listed by the USDA for one tool raw onion (110g) measuring about 2 1/2 inch in diameter.


One tool onion contains 10 grams of carbohydrates. The these, 4.7 grams are sugar and also 1.9 grams room fiber. Onions have a low glycemic index in between 10–15.


On their own, onions save minimal fat. Onions are often prepared with included fat, however, either sautéed in oil or butter, spanned in salad dressing, or breaded and also deep-fried.

Vitamins and also Minerals

Onions carry out vitamin C, folate, and also manganese. Onions additionally contain some calcium and potassium.

health Benefits

Onions contain many health-boosting phytochemicals to aid ward turn off disease. Together with sulfur-based compounds, onions room rich in quercetin, a an effective antioxidant.

Fights Heart disease

Onions contain powerful compounds, dubbed allyl sulfides, that help prevent heart disease. The vitamin C in onions likewise acts as a powerful antioxidant the is advantageous for cardiovascular health. Finally, onions own an superior flavonoid, referred to as quercetin, that reduces blood pressure and inflammation. all of these factors, linked with their herbal fiber and also potassium content, do onions a clear an option for anyone hope to boost heart health.

may Prevent Cancer

The allyl sulfides in onions are also protective against cancer. specifically, diallyl trisulfide is responsible for regulating numerous pathways associated with cancer development. These incorporate arresting the cell cycle, staying clear of the migration of cancer cells, and also inducing apoptosis (programmed cell death).

Reduces excessive weight Risk

Lab studies suggest multiple mechanisms whereby onions can inhibit overfill fat storage. Onion extracts block the generation of new fat cells and increase energy expenditure through thermogenesis. Quercetin is assumed to be efficient at transforming white fat cells right into brown fat cells, i beg your pardon are an ext metabolically active. Note, however, the these studies were not performed on humans, so more evidence is needed to recognize if this benefit is relevant.

Supports masculine Fertility

Onions show promise in the treatment of masculine infertility. The quercetin in onions is advantageous for both sperm motility and viability. Onion peel extract has been presented to boost the activity of the Hv1 channel, which plays a an important role in sperm function. Studies suggest that the impacts of onion peel space so powerful, they could lead come the breakthrough of infertility medications.

boosts Memory

Onions save on computer inulin, a form of soluble, prebiotic fiber the feeds healthy bacteria in the gut. The is thought that a gut-brain axis exists, connecting messages from the digestive device with mind activity. A double-blind, placebo-controlled study tested the impact of inulin top top mood and cognitive performance. The sloop down of inulin was associated with renovations in the participants' short-lived recall and recognition. Although an ext studies are required to determine cause and also effect, the inulin in onions might be beneficial for cognitive functioning.


Allergy symptoms, like asthma, skin rash, and also runny nose, are an ext often viewed as the an outcome of managing onions fairly than ingesting them. Nonetheless, anaphylaxis as result of an IgE-mediate an answer (as through a typical food allergy) has actually been observed following the intake of cooking onions.

It is possible to endure allergy symptoms from emotional onions or eating them, either instantly after exposure or several hrs later. If you believe you have an onion allergy, speak to your physician for a full evaluation.

Adverse effects

Onions have the right to irritate the eyes because of sulfuric acid, which is produced and also released during the cut process. Once you cut an onion you rest cells, releasing their contents. Enzymes the were kept separate mix with the sulfenic mountain to produce propanethial S-oxide, a sulfur compound the wafts upward toward your eyes, making them burn and tear. To minimize irritation, shot wearing goggles or chilling the onion prior to slicing.

Onions save sulfurous compounds that have the right to be absorbed into the bloodstream as soon as ingested and also can escape from ours pores when sweating. Therefore, some human being may "smell favor onions" after eat them. Onions, specifically raw onions, can sometimes make her breath smell. To eliminate onion breath, try eating some parsley.

Onions likewise contain fructans. Anyone complying with alow FODMAP dietfor irritable bowel syndrome should be mindful that onions might cause ab pain, bloating, and gas.

When onions are eaten as a entirety food ingredient (rather than taken in a supplement form) they space generally taken into consideration safe. Acquisition high doses of onion supplements, however, could potentially interact with some medications, for this reason let your doctor know about any supplements you take.


Onion bulbs come in 3 colors: red, yellow, or white. relying on how lot daylight is compelled for onion bulb formation, onions are classified by farmers as short-day (under 12 hours), medium-day, or long-day (14 hours or more). Onion ranges are tested based upon their sweetness and also pungency. Onion bulbs of the same color may differ in taste based upon their chemical composition. Disease-resistance additionally varies amongst the different types of onions.

You deserve to buy new onions or purchase dehydrated onions or onion flour to include flavor as soon as cooking. In enhancement to typical bulb onions, green onions or scallions are smaller and more mild-tasting. These leafy varieties are actually simply immature onion bulbs that were picked prior to reaching maturity.

when It's finest

Onions have the right to be uncovered in supermarkets at any kind of time of the year. Pick onions that are free of bruises and cuts. Onions must be firm, not squishy. Protect against pre-cut onions that show up dried out or slimy. Always use pre-cut onions through the expiration date detailed on the package.

Storage and Food security

Use fresh onions in ~ 2–4 mainly or purchasing. Keep in a dry, well-ventilated area at room temperature. To wash onions under running water before cutting right into them. When you slice an onion, it deserve to be save on computer in the frozen fridge for approximately 7 days yet should it is in discarded if you an alert any indicators of mold.

To keep onions in the freezer, chop into 1/4 to 1/2 inch sections or right into a little dice. Onions that space peeled, washed, and sliced don't should be blanched prior to freezing. freeze them flat on a baking sheet and also then location them right into airtight containers. This lets you remove pieces that frozen onion together needed, fairly than the pieces sticking together. Onions can likewise be pureed into a paste prior to freezing. Onions will store in the freezer for as much as a year.

exactly how to Prepare

Use onions to flavor sauces, stews, chili, or soup. Optimal sandwiches, wraps, or burgers through a part of onion. Dice raw, grilled, or sautéed onions and put lock in your salads, next dishes, or eggs.

Verywell Fit supplies only high-quality sources, including peer-reviewed studies, to assistance the truth within ours articles. Check out our editorial procedure to learn more about just how we fact-check and keep our content accurate, reliable, and also trustworthy.

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