For those who can manage to eat for less than $5 a day, how tall are you? I feel like at 6'2'', it's impossible for me to not eat for less than $10/day. And I eat pretty healthy too, but the cost to eat healthy is higher than to eat crappy.
Health and fitness are a top priority for me.
You can eat healthy for not all that much more than eating crappy. But you don't do that at restaurants, you have to be frugal about it. I'm 5'10". If I were 6'2" I figure my food costs would go up maybe 10%.
I buy some organic stuff, but don't insist on that. My apples, yes, organic, because I heard that the pesticides they use on apples are particularly harmful. Same goes for my coffee beans, for the same reason. I buy some other organic stuff, or at least pesticide free, when reasonable.
Many years of living frugally have given me a lot of understanding of how to keep my food bills down. I haven't been keeping score lately, but I'm pretty sure my daily food cost is under $6 on average. That's everything I ingest.
I don't obsess about eating healthy, but I absolutely think about it and keep my indulgences in check. For instance, I'll eat some chocolate, an occasional hot dog, will indulge at times when I do eat away from the house. I try to limit my sugar and salt intake, it's not hard for me to do that. My blood tests are stellar.