I'm surprised no one has said it yet

You can't target which spot your body wants to lose fat

You usually lose fat as a whole, all over your body and which spot loses it quicker all depends on genetic

you will lose weight if you only eat veg (which is pretty low in calories) and drink water

however you might run into the situation what most of the people call 'skinny fat' aka skinny arms and skinny leg with bloated or flappy stomach

there is no easy way out and nothing beats doing sport+ having an appropriate nutritious diet

even if it's just a swim a week, a jog in the garden or a few pull ups push ups a day will help a lot more than just eating veg and drinking water