When I was ‘fat Matt’, I used love making tuna melts on a big bagel, using store-made tuna salad (which was heavy with conventional, soy-based, highly refined mayonnaise), and cheese.
I still make tuna melts at home today; I simply use different ingredients; pole-caught, mercury tested tuna, almond flour tortillas, non-dairy cheese, and avocado-based mayo.
There are many other examples of unhealthy versions of foods I love, for which I now make healthy ones.
You can enjoy what you eat without killing yourself.
Matt Fried 