You're right, it does seem unhelpful (just eat/smoke/<insert vice> less!).
What is the proposed alternative though? Most people need a general rule they can follow to help them (read: can't afford a nutritionist/doctor). If it's a willpower issue, then we need to solve that, but just saying "Oh eating less won't help me" is just as bad.
What is the proposed alternative though? Most people need a general rule they can follow to help them (read: can't afford a nutritionist/doctor). If it's a willpower issue, then we need to solve that, but just saying "Oh eating less won't help me" is just as bad.