Calories are units  of energy – it helps to calculate and estimate how much energy your body could get from eating or drinking foods.
How many calories  does the human body require to stay healthy?
The healthy amount of calories to consume is largely dependent on your age activity level, according to a general study, grown males require 2,000-3000 calories per day to maintain normal body weight, and grown females need around 1,600-2,400 calories daily. Compared to other animals, humans do not require a lot of calories to stay alive. There are approximately 81,500 calories, which is significantly less than in big animals. A horse holds more than 200,000 calories, and a bear takes up approximately 600,000 calories.
Here are some of the foods  that have the highest number of calories.