Jestliže sníme potraviny, které tělu zajistí stejné množství energie, jež spotřebuje, udržujeme si konstantní váhu.
If we eat food that provides the same amount of energy as we utilise, we maintain a constant weight; if we consume less energy than we use, we lose weight; if we consume more energy than we use, the weight inexorably rises. We know this but very few of us can achieve the correct balance.