I eat vegetarian a lot. I buy only fresh ingredients and cook from scratch - that way, when I feel like snacking and look in my fridge, it's: 'Oh, baby carrots or chocolate soy pudding. Take your pick.'
I have more freedom when I write fiction, but my memoirs have had a much stronger impact on my readers. Somehow the 'message,' even if I am not even aware that there is one, is conveyed better in this form.