I was always big on eating just to fulfill my macronutrient and calorie requirements.
If i needed 200g protein, 300g carbs and 60g fat, i ate anything that allowed me to hit that goal. I was always able to lost or gain or maintain the way i wanted to doing it this way.
However, my wife wanted to lose some fat, and she truly believes eating "healthy" is the way to go. Whatever not my thing.
So i switched from a true IIFYM eating style to a mostly "bro" diet, of chicken, beef, fish, rice, greek yogurt, fruits and veggies and about a month in I became a believer. I digested my meals better and felt better all around. Could also train harder without getting sluggish.
Did i get better results in the fatbloss department? I 100% did BUT it was not because of my food choices. My calorie intake was the same as before. The reason my fat loss sped up was because i was able to train harder, longer, more frequently withiut getting gassed. Thats where the food came in.
Tldr
Focus on your calories and macronutrients 1st and foremost
Then if you want to take things a step further, look at your food sources and clean them up
The major thing is adherence over long periods of time