I've never really started a low-fat diet, but I do eat less fat in a single meal (not necessarily throughout the entire day though) than I did before I met my dh, mainly because he dislikes fatty foods. He's also allergic to milk, so we cook mostly without it. I notice that my tolerance for dairy products is drastically lowered after many years of a low-dairy diet, and eating a single fatty meal can upset my stomach and have it roiling about.