Whether a plant based protein will make you gain weight depends on a variety of factors, including your overall diet, activity level, and calorie intake. Plant based protein sources such as peas, mung beans, and fava beans are generally lower in calories and fat than animal-based protein sources, which can make them a good option for weight management.
However, if you consume plant based protein sources that are high in calories and fat, such as nut butters or processed plant based meats, and you consume them in excess, it could contribute to weight gain. Ultimately, it's important to focus on a balanced and varied diet, and to pay attention to portion sizes and total calorie intake to help maintain a healthy weight.