The increase in metabolic rate after a meal is called

The thermic effect of food.

Explanation:

The process in which metabolic rate increase after meal is called the THERMIC EFFECT OF FOOD.

THERMICAL EFFECT OF FOOD can be defined as the way in which some calories a person or an individual consumed after meal help to break down the food for easy absorbing and to store the food consumed while some are burn off during execise which is why a person or an individual metabolic rate may elevate after meal, during exercise or due to some other factors reason been that human body makes use of energy everyday due to day to day activities.

Example a person who consumed a protein food may experience high THERMIC EFFECT than the person who consumed food that contained fat or carbohydrates reason been it can take a long time for such person body to break down the food, burn and absorb the protein.

Therefore The increase in metabolic rate after a meal is called THERMIC EFFECT OF FOOD.