well vomiting is not the reason for weight gain , please consult with doctor first for why are you vomit very often after eating ,because might there some digestive issues ,gut health issue.

Gud morning pls connect with physician at first.

Sorry but this sometimes a psychological condition or gastrointestinal problem Kindly elaborate over consultation to help better

It seems to be psychological conditions

Healthy morning, If you vomit shortly after a meal, the cause may be food poisoning, gastritis ( inflammation of stomach lining) , an ulcer or bulimia. If it happens 1-8 hours after you eat , that may also indicate food poisoning.

When someone vomits frequently after eating, several factors can contribute to potential weight changes. 1. Loss of nutrients:Vomiting leads to the loss of nutrients and calories that were consumed. Initially, this might result in weight loss, especially if vomiting occurs immediately after eating. 2. Compensatory behaviors:The body might compensate for the lost calories by increasing appetite or altering metabolism to conserve energy. This can lead to overeating or changes in metabolic rate, potentially causing weight gain over time. 3. Fluid balance:Vomiting can also disrupt fluid balance in the body, leading to fluctuations in water weight. 4.Health consequences:Frequent vomiting can have serious health consequences, such as electrolyte imbalances, dehydration, and damage to the esophagus and teeth. These health issues can impact overall well-being and may indirectly influence weight.