Ron Peterson wrote:

IIRC, the body is inefficient at converting carbohydrates to fat so
that is a possible cause for the weight loss. Of course, the other
nutrients in a vegetarian diet might be helpful in burning calories.

That's the principle behind low fat diets. If you go on a low fat
diet and you aren't constantly hungry, go for it. The advantage
of low carb diets is more people aren't hngry on them. Both
work for some people.