Does onion soup really make you lose weight?

It's mostly just early 2000s marketing hype, that stuff. Onion soup by itself is low in calories, yeah, but it's not magic or anything. The thing is, if you eat only soup for days, sure you'll lose weight fast, but that's just because you're creating a huge calorie deficit. Any ultra-restrictive diet will make you lose weight quick, except it's not sustainable and you don't get enough nutrients. After a few weeks, most people gain back everything they lost because they can't stick with it.

What's interesting about onion soup is that it actually has some nutritional value - onions have fiber, antioxidants, they're good for digestion. But the idea that it's going to "actively burn fat," that's pure myth. The only thing that actually works for losing weight is a calorie deficit you can maintain over time, combined with decent lifestyle habits. If you want to include onion soup in a balanced diet, sure, why not, but it's not what's going to make the difference.

I think your mom probably got results back then just because she was eating less overall, not because the soup had magic properties. People are always trying new stuff today, but nutrition specialists pretty much agree that fad diets rarely work long term. Better to aim for gradual changes to your diet instead.

Even though onion soup itself isn't bad for a diet. The thing is it's low in calories and it fills up your stomach, so you feel full longer, but it's not magic either. If you eat it exclusively for a week you'll lose weight, but it's mainly water and muscle, not really fat. People still try it today but it's never a sustainable solution, and frankly a balanced diet with fewer calories works better in the long run.

Like I said before, it's clearly marketing stuff from the 2000s all that. Onion soup in itself isn't great for losing weight, it's mostly just that it's super low in calories and takes up space in your stomach, so you end up less hungry. But honestly, any low-calorie food would do the same thing, you just gotta not believe there's some magic ingredient in it. If you wanna lose weight in 2026, you're better off looking at what you eat in general rather than betting on some miracle soup.