When I became a vegan, I lost four kilograms in two weeks, which is quite significant for my complexion. So yes, it's useful. Another thing is that such a diet does not harm health, some rules must be observed: eat fruits in the morning (this is the same sugar, only healthy, and so that it does not go to the sides, it is better to eat it early) and it is imperative to eat legumes , ideally lentils. There is most of all protein, namely, it is not enough when you refuse meat, eggs, and milk.
Vegetarianism, as such, does not lead to weight loss. Besides. things like potatoes, most legumes, rice, bananas, and more lead to weight gain. Be careful with fruits - many of them contain too much fructose. which does not contribute to weight loss.