Question

eventually energy is absorbed in digestion then why it is called exothermic reaction

Answer 1

Chemical reactions that absorb (or use) energy overall are called endothermic. In endothermic reactions, more energy is absorbedwhen the bonds in the reactants are broken than is released when new bonds are formed in the products.

Answer 2

A reaction in which energy is absorbed from the surroundings is called an endothermic reaction. In endothermic reactions the enthalpy of the products is greater than the enthalpy of the reactants. Because reactions release or absorb energy, they affect the temperature of their surroundings.