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 MBA in marketing. She is also the founder of Marisa Moore Nutrition.

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Members the the lily family, onions room a highly aromatic vegetable supplied in cuisines about the world. Girlfriend may have heard rumors that onions come to be toxic after they're cut, or that onions room too starchy for those on low-carbohydrate eating plans. However, these rumors are easily dispelled after reviewing the study on onions.

Onion Nutrition facts

The adhering to nutrition info is provided by the USDA for one medium raw onion (110g) measuring about 2 1/2 inches in diameter.


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


On your own, onions contain minimal fat. Onions are often prepared with included fat, however, one of two people sautéed in oil or butter, extended in salad dressing, or breaded and deep-fried.

Vitamins and Minerals

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

wellness Benefits

Onions contain numerous health-boosting phytochemicals to assist ward turn off disease. In addition to sulfur-based compounds, onions are rich in quercetin, a powerful antioxidant.

Fights Heart condition

Onions contain powerful compounds, dubbed allyl sulfides, that aid prevent heart disease. The vitamin C in onions additionally acts as a an effective antioxidant that is useful for cardiovascular health. Finally, onions possess an exceptional flavonoid, called quercetin, the reduces blood pressure and also inflammation. every one of these factors, an unified with their herbal fiber and potassium content, make onions a clear an option for anyone hoping to enhance heart health.

may Prevent Cancer

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

Reduces excessive weight Risk

Lab studies imply multiple mechanisms whereby onions might inhibit overabundance fat storage. Onion extracts block the generation of new fat cells and increase energy expenditure with thermogenesis. Quercetin is thought to be reliable at transforming white fat cells into brown fat cells, i beg your pardon are much more metabolically active. Note, however, that these researches were not performed top top humans, so an ext evidence is needed to recognize if this benefit is relevant.

Supports male Fertility

Onions present promise in the therapy of male infertility. The quercetin in onions is advantageous for both sperm motility and also viability. Onion peel extract has been presented to boost the task of the Hv1 channel, i beg your pardon plays a crucial role in sperm function. Studies indicate that the effects of onion peel are so powerful, they might lead to the breakthrough of infertility medications.

boosts Memory

Onions contain inulin, a kind of soluble, prebiotic fiber the feeds healthy bacteria in the gut. The is thought that a gut-brain axis exists, connecting message from the digestive device with brain activity. A double-blind, placebo-controlled study tested the influence of inulin top top mood and also cognitive performance. The sloop down of inulin was linked with enhancements in the participants' short-term recall and also recognition. Although more studies are essential to identify cause and also effect, the inulin in onions may be advantageous for cognitive functioning.


Allergy symptoms, favor asthma, skin rash, and also runny nose, are more often viewed as the an outcome of dealing with onions rather than ingesting them. Nonetheless, anaphylaxis because of an IgE-mediate solution (as with a typical food allergy) has actually been observed following the input of cook onions.

It is possible to suffer allergy symptom from poignant onions or eating them, either instantly after exposure or several hours later. If you think you have actually an onion allergy, speak come your medical professional for a full evaluation.

Adverse impacts

Onions have the right to irritate the eyes due to sulfuric acid, i beg your pardon is produced and also released during the cut process. Once you cut an onion you break cells, releasing your contents. Enzymes that were kept separate mix with the sulfenic mountain to create propanethial S-oxide, a sulfur compound the wafts upward towards your eyes, making castle burn and tear. To minimize irritation, try wearing goggles or chilling the onion before slicing.

Onions contain sulfurous compound that can be absorbed into the bloodstream as soon as ingested and also can escape from our pores as soon as sweating. Therefore, some world may "smell prefer onions" after eat them. Onions, particularly raw onions, have the right to sometimes make her breath smell. To get rid of onion breath, shot eating part parsley.

Onions additionally contain fructans. Anyone adhering to alow FODMAP dietfor irritable bowel syndrome should be aware that onions may cause abdominal muscle pain, bloating, and gas.

When onions are eaten as a whole food ingredient (rather than taken in a supplement form) they are generally thought about safe. Acquisition high sheep of onion supplements, however, can potentially interact with part medications, so let your medical professional know around any supplements friend take.


Onion bulbs come in three colors: red, yellow, or white. relying on how much daylight is required for onion pear formation, onions are classified through farmers as short-day (under 12 hours), medium-day, or long-day (14 hours or more). Onion arrays are tested based on their sweetness and also pungency. Onion bulbs of the same shade may differ in taste based upon their chemistry composition. Disease-resistance additionally varies amongst the different species of onions.

You have the right to buy fresh onions or acquisition dehydrated onions or onion flour to add flavor as soon as cooking. In enhancement to common bulb onions, environment-friendly onions or scallions are smaller and much more mild-tasting. These leafy varieties are actually simply immature onion bulbs that were picked before reaching maturity.

as soon as It's best

Onions have the right to be uncovered in supermarkets at any kind of time that the year. Select onions that are cost-free of bruises and also cuts. Onions must be firm, no squishy. Stop pre-cut onions that appear dried the end or slimy. Constantly use pre-cut onions through the expiration date listed on the package.

Storage and Food security

Use fresh onions within 2–4 mainly or purchasing. Store in a dry, well-ventilated area at room temperature. To wash onions under running water prior to cutting right into them. As soon as you slice an onion, it can be save on computer in the frozen fridge for up to 7 days however should it is in discarded if you notice any indicators of mold.

To preserve onions in the freezer, chop right into 1/4 come 1/2 inch sections or into a tiny dice. Onions that are peeled, washed, and sliced don't need to be blanched before freezing. frozen them flat on a baking sheet and also then ar them into airtight containers. This lets you remove pieces of frozen onion as needed, quite than the piece sticking together. Onions can additionally be pureed into a paste prior to freezing. Onions will keep in the freezer for up to a year.

how to Prepare

Use onions to flavor sauces, stews, chili, or soup. Peak sandwiches, wraps, or burgers v a slice of onion. Dice raw, grilled, or sautéed onions and put lock in your salads, side dishes, or eggs.

Verywell Fit uses only high-quality sources, consisting of peer-reviewed studies, to assistance the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and also trustworthy.

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