It is best to run for more than 30 minutes, because at first, people's blood sugar will drop because of the decomposition of liver glycogen, and fat will be consumed after 30 minutes. It is best not to eat or eat a bowl of gruel at night, of course, the slimming effect is definitely not good. It is also good to eat an enzyme fruit during the day to improve metabolism and achieve the effect of metabolizing and decomposing fat during exercise.