Will a vegan diet make you gain weight?

To gain weight on ANY diet you just need to eat more calories than you are expending. Try using an online calculator to figure your daily calorie expenditure. Then just eat more calories than you are expending.

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You could if you ate lots of high energy foods, for example lots of vegan chocolate

or you could eat foods high in fat such as nuts and avocados.

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Also, junk food (i.e. soda, chips, fries, etc) will cause you to gain weight. A lot of carbohydrates will cause weight gain.

if you want to gain weight healthily just simply eat more food...