You know that in order to gain mass, you should eat more calories than you are burning during the day. Well, if you are the type of person who has always struggled to bulk, you might want to get inspired by the blue whale. Every time this beast tries to reach 8 miles per hour for feeding purposes, it uses around 770 to 1900 calories. But in return, the blue whale can eat half a million calories in a single mouthful which represents 6 to 240 times the energy spent. The blue whale is the largest animal that has ever lived so I guess that it makes all sense that it has to eat a massive amount of food to not starve to death!