This question is tricky, depending on the person. It’s normal to gain weight when eating any food. If you are eating lots of carbs from pasta, you can gain weight. A person who goes fully vegan would not gain weight. The reason is that you are eating healthy. It’s just like a regular diet. You lose weight with healthy food. If you are gaining a lot of weight, you are eating other things that cause weight gain. Like I said before, carbs make people gain weight. If you like sweets, that can also make you gain weight.
If someone is eating a plant-based diet, they won’t gain weight. They will also not try to lose much weight because you have to eat a lot of plants to maintain your health. It’s crazy because people think that vegans drop weight just like that, which isn’t true. You still gain weight, depending on what you eat. This doesn’t mean that you shouldn’t eat vegan. It is still healthier, and it’s better for the environment.