No, you don't sound like an ass, but I feel like I've been where you are and have a bit more perspective to add.
Circadian rhythms are a thing, and eating within a time window may have a great effect for some people. I'm already very rigid with my eating patterns and I don't see that it adds any value except for giving me a headache if I happen to miss my window.
Eating mostly plants is probably a good idea, I know there's mountains of evidence backing it up. But every time I try it, I find it difficult to physically put enough food in my body to satisfy my energy needs. I have to spend so much time shopping, prepping, cooking, and planning - activities that I do not enjoy - that I end up less happy because I'm spending my time on something I don't want to do.
In addition to that, eating a lot of plant material gives you hella constipation. Believe me, I know. Maybe your body gets used to it after a while, but a month of asshole-tearing shits is enough to tell me that I need more meat and dairy in my diet. I lift - at least, when I'm able to eat enough calories to sustain the energy level I need to lift, I lift. That hasn't happened for a while because I'm trying to save up for something and be frugal, so I've been eating less meat and dairy to save money. As a result, I don't have enough energy to lift. There just aren't enough hours in the day to consume that many calories in beans.
There are counterarguments for all the points I've made, I know them all. But arguing the points is another example of the hackernews type toxic thinking. You don't need the counterarguments. You know that the changes you recommend work, because they worked for you.
Fair enough. But magnesium worked for me, and I didn't even have to give up meat. Chances are switching to a mostly-plants non-shit diet would have given me the same effect, but my way is soooo much easier. If all someone needs to not be depressed anymore is a vitamin, then damn, they need to know what that vitamin is. Because when you're depressed, healthy eating is really unlikely to happen. You NEED the shortcut.