Spring onions are an excellent source of vitamin C and calcium. They are also a good source of dietary fibre and vitamins A and B6, thiamine, folate and minerals (potassium, copper, chromium, manganese, iron). Spring onions not only taste great but are also extremely healthy for the body. ... Both the green leafy part and the white bulb of the spring onion are edible. It tastes a little milder than the regular onion and can be cooked or eaten raw as well. In brief, spring onion has good anti-inflammatory, antimicrobial and anticancer potential and it is recommended to use these extracts on the pharmaceutical level. Onions are a source of soluble fibre, which makes it a powerful prebiotic food. It ensures a healthy gut, which is crucial for weight loss and belly fat loss. Bake them, squeeze the juice out of them, soup them or eat them raw- there are a number of ways to eat onions to lose belly fat quickly.