There are myriad diet plans out there. Some make sense to me, but most do not. A diet that simply reduces the number of calories each day seems very logical; if I expend more energy than I consume, then the deficit will be made up from my (sometimes sizeable) reserves.
Diets that demonize individual food groups do not appeal to me. No meat, so donuts are OK? No bread? All potatoes?
It's not the "bad" food that causes weight gain, but it is too much of whatever we eat. I strongly believe that humans (for better or worse) are meant to eat everything. Meat, veggies, sweets, bland, spicy, hot or cold. If it can be eaten, we can are designed for that.
I view exercise the same way. I think injury is born from specialization. I would much prefer to find a mix of activities to maintain my fitness. This means running, weightlifting, gymnastics, rowing, swimming (a little, I'm like a rock in the water), snowboarding (maybe skiing, a little), snorkeling and scuba diving, rock climbing, hiking, soccer, basketball, or just making up a game outside. I fear losing strength and mobility as a result of inactivity, so I just want to keep moving in whatever modality strikes.