My parents tried to get me to gain weight my entire life. It led to a pretty bad diet by the time I was living on my own and I only ever gained weight when I ate chicken burgers from meal hall literally every day.
Don't focus on weight, just make sure he is healthy. It can lead to poor choices and insecurities down the road.
Shit coffee and an even more shit company. Sells "Canadianess" using cheap foreign labour and takes the profits out of country.