VCs invest to make money, and I just can't see what the revenue model would be. There's no ad revenue to be had in convincing people to stop looking at their phones.
Get people to pay for an app? Any price other than free means crossing a pretty major psychological barrier.
Read Michael Pollan's books and essays about the "healthy" food market, and marketing "magic ingredients" that make factory junk food "healthy". Omega-3! Chia seeds! Vitamins!