I dont think there is anything wrong with making healthy-life suggestions. If it doesnt work for you, politely tell them it doesnt work for you.

I just watched something that said there is a gene that they have found that contributes to major depressive states. The negative gene is only activated from stressors in the individuals life. Otherwise the person will look exactly like the positive version of this gene. The video didnt really explain if medication actually works though.

I hate that people get defensive easily, including myself.