Fitness should not just be about exercise, should not just be about putting on the right gear and running twenty miles, or using the treadmill or exercise bike once a month.
It has to be a way of life, from the food you eat, your daily routine, water/fluid intake, clothes you wear, and our overall physical appearance.
Food is definitely a big deal because as the saying goes "garbage in garbage out". Always have an alkaline food palette with plenty of vegetables, fiber and proteins. Limit the carbohydrates and saturated fats.
We need the energy yes, but in today's society where work is more mental than physical, all that unused energy/sugar is simply converted to fat and stored on your upper arms, belly and thighs etc. consequently the weight piles on.
I love my dessert and snacks so I usually skip breakfast (not good the doctors would say), a high protein and fiber dish for lunch and snacks for dinner.