Make a vegan fat shake regularly to get more calories.
Here is the recipe:
Your vegan diet must be balanced if you want to have normal weight, so find soy alternatives for dairy and meat products and have enough of them every day. Protein is the most important for gaining weight.
It happens from time to time that you spend your time with not vegan people, who take you to not vegan places where you can order only a drink. So always have a nice vegan snack with yourself to be sure you won't skip any meal.
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