"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.

the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy

i believe it would be c: tons.