When it comes to your nutrition & weight, the laws of thermodynamics & physics apply:
Energy can neither be created nor destroyed; only transferred.
Therefore, you can change your daily energy balance:
- The quantity & quality that you take in;
- The quantity & quality that you expend out;
- How efficiently your body’s systems metabolize all of that energy.
That’s it.
Simple, but not necessarily easy.
Matt Fried 