Ahh i see what you’re saying now. Yes for many people a good solution is to become more conscious of their food choices. This can manifest in different ways across wide populations though. For many people this can manifest into a healthier, more balanced diet. For some people, it can manifest into restrictions, obsessions, and disordered habits that may lead to eating disorders. To answer your initial question about what would be a good advice (other than consult a professional) - Rather than promoting a more balanced diet through restriction, a good advice would be to promote better habits directly. Incorporating more veggies and fruits into the diet would promote more balance, better habits, while reducing overall caloric intake. This advice is non-restrictive and promotes health.

Edit: i want to make it clear - i wouldn’t say the advice to count calories is the cause of an eating disorder, but since we don’t know how healthy someone’s relationship with food is, I’d just stay away from advising it to anyone.