For instance, the consumption of sugar - sweetened beverages, sweets, and processed
foods may make it harder to do so, whereas the consumption of whole grains, fruits, and vegetables might make it easier.4 - 10 Physical activity should also influence long - term weight gain, but evidence to support this expectation has been surprisingly inconsistent.11 - 14 In addition, the duration of television viewing and of sleep may influence energy consumption, energy
expenditure, or both.15 - 19 Different lifestyle behaviors have often been evaluated separately, thus limiting
relative comparisons or the quantification of combined effects.