I was much more conscious of my scent control when I was younger. Scent-free showers before every hunt, storing my clothes in scentproof containers, getting dressed in the cold and not driving with my hunting gear on, wiping/spraying down before every hunt, only wearing rubber boots, chewing Gum-O-Flage, and generally not eating "stinky" food like garlic or onions before a hunt. So yes, I have altered my diet in some way to help with scent control. Or at least to make me feel like I was giving myself an advantage. Now that I'm older, I find that most of that stuff isn't worth the effort, and I'm not as obsessed with needing to kill a deer or a specific buck each year. I like to get dressed in my garage, wear my non-rubber hunting boots, eat some Casey's pizza, and go hunting. I have a lot more fun when it's not so complicated. This is what being in your mid 40's is like.
Gum-O-Flage went out of business, sadly. I liked those guys! The Honey Alfalfa flavor was pretty good too. If someone brought it back, I would definitely use it again. I chew gum a lot when I'm hunting anyways.
