"snacks account for approximately % of daily food energy among adolescents"

In adolescents the snacking trend is on the rise.  Any normal child consumes up to three snacks a day. The snacks that are on increase in consumption are mostly candies and other salty snacks. The major source is still largely based on the consumption of sweetened beverages and other desserts. On average approximately 23% to 39% of daily food energy in adolescents comes from snacks. These patterns can play a major role in childhood obesity.

coal is not sustainable because it will one day run out.

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.