I'm a big believer in "you are what you eat". That much I agree with. Does it raise SMV? Hell no. But my mood is much better when I am eating 1200 calories compared to when I'm binge eating constantly and eating 7000+ calories in a day (for example, during bad times, my room looks
like this full of unhealthy and excess food). Obviously low body fat for men is ideal since it reveals bone structure, and diet is the largest factor in weight.
The main arguments again gyms by incels, which I largely agree with, is that the benefits you
may gain fall far short of the work required to get them, if they can even be achieved at all. Gym is largely worthless if you don't have the right bone structure/frame. It takes hours and hours weekly in a gym (not to mention gym fees, extra food/diet supplements, training clothes/materials, etc,) just to get a small boost in SMV, when a simple (hypothetical) increase of 2" in height would do far more.
Also:
https://looksmax.org/ might be your place if you really think the gym is worth it.
Burning calories is a meme. It does not help you lose weight.
Largely true. Losing weight is
at least 90% diet, if not more. I lost 100lbs on and off over 6 years almost exclusively through diet.