A closer look at nutrients, compounds, and prep
Serious? Onions? I know this sounds like the opposite of thrilling. They are a pretty polarizing everyday food. My sister especially loves red onion. I, on the other hand only enjoy them when they are cooked. Raw versions feel overpowering to me and that pungent bite tends to take over anything else on the plate. That contrast got me thinking about layers of flavor and function and whether there is a real difference between eating them raw or cooked beyond taste. Is there an actual benefit? Either way, let’s dig into it.
Starting with the basics this savory staple is considered nutrient dense meaning you get a lot for relatively few calories. One medium onion comes in at about 44 calories with 0.1 grams of fat 1.2 grams of protein and 10.3 grams of carbohydrates including 4.7 grams of sugar and 1.9 grams of fiber. On the vitamin and mineral side you get small amounts of potassium along with vitamin C. From a metabolic and cardiovascular perspective protein and fiber both play supporting roles. If you read my work often you know fiber functions as a prebiotic which supports gut and immune function. Vitamin C plays a role in immune support collagen production and iron absorption. Nerve function also relies on B vitamins and onions provide some folate and B6 which helps round things out.
What often gets overlooked are the protective compounds. There are more than 17 types of antioxidants found in onions including quercetin. Red onions contain higher levels of anthocyanins which are associated with protection against diabetes and certain cancers. These compounds also support cardiovascular health. In one small study involving people with type one or type two diabetes participants experienced significantly lower fasting blood sugar levels four hours after eating 100 grams of red onion. That is a meaningful response from such an everyday ingredient.
All of this suggests onions can absolutely be on our side offering real benefits while adding depth and layers to meals. I will be honest I am still selective about how I eat them. That said they are easy to incorporate and incredibly flavorful. Many studies involve people eating a whole medium onion fairly regularly. To make that realistic cooking is often the easiest route. I use onions as a base constantly. If I am grilling roasting or making just about anything I add one. French onion soup is a classic for a reason. Eggs are better with onions mixed in. Salads and proteins pair well with grilled or caramelized onions. Sauces and soups almost always start with them which builds that savory foundation.
While I tend to recommend cooking them Tufts University points out that raw onions contain higher levels of sulfur compounds. Those compounds are associated with cancer protection reduced LDL cholesterol production and lower blood sugar levels. So there is value on both sides depending on preference and tolerance.
Those same sulfur compounds are also why cutting onions makes us cry. They are drawn to moisture and our eyes are an easy target. There are a few strategies to reduce the tears. Wearing ski goggles while chopping creates a physical barrier. My grandmother swore by holding water in her mouth while cutting. Another suggestion is placing a cup of water next to the cutting board since sulfur compounds seek water for dilution. I cannot say this is scientifically proven though I recently cut a red onion on a damp cutting board and experienced zero irritation. It could be coincidence or psychosomatic or both though it might be worth trying.
So yes, onions are worth eating just maybe not like an apple. Unless you want to smell like them for days.