I tried

That's a bad way to go about it.

The only way you're going to get over an addiction or lose weight is if you do it for yourself.

What works for me is a calorie counting app. It makes you realize that even that small piece of chocolate you had for a snack is pumped with calories and makes you more aware of what you eat. I lost 3 kgs in 2 weeks so I think it works!

The guy must be a real catch if someone feels the need to lose weight to impress him.