Stress in intellectual work leads to more abundant nutrition and increased caloric intake and at some point - weight gain. Canadians conducted research among 14 students involved in three types of tasks - reading and summarizing text, taking computer memory tests or just relaxing. In all of them the energy loss is minimal.

However, it turns out that students doing the first two types of activity consume 203 and 253 kcal more, respectively. Blood tests before, during and after tasks show an increase in glucose and insulin during mental activity.

It is clear that glucose serves as a source of energy for the brain during intellectual work. To maintain a level, our body wants more calories. However, they added to the minimum physical activity are the ideal basis for weight gain.