This is a generalization, of course, but when you eat and exercise for your best health, your body will figure out the details.
First things, first—we are all different. Our bodies respond differently to different things, and our perception and relationship with our bodies, exercise, and food are complex. In your fitness journey, in particular, listen to your body, and focus on eating well and exercising to create a better life for yourself, not reworking your entire life to look a certain way or weigh a certain amount.
Seriously, so much depends on variables that are unique to each individual; it honestly takes a lot of trial and error and genuine self exploration to find out exactly what works best for each of us. Try not to compare yourself to others, and realize that no one understands what you are going through better than you! There is no “one” answer that works for everyone.
Don’t be discouraged by this, but instead see it as an opportunity—we all have the ability to affect positive change in ourselves (though at different rates and with unique results) through eating well and exercising intelligently. How amazing is that?
Bottom line, if you want a healthy, fit body that is easily maintained over the years, a smart, moderate approach to both nutrition and exercise is what you want to aim for...your body will thank you!