Cachexia is a condition which denotes the excessive loss of weight. It occurs because of the depletion of adipose tissue and muscle mass in people who are not trying to lose weight.
Nutrients are the structural components of food that the body needs to function properly. They are divided into macronutrients (proteins, fats, carbohydrates) and micronutrients (vitamins, provitamins, various minerals, and so on). Their shortage is called nutritional deficiency.
There is growing evidence that adipose tissue plays a key role in the aggravation of COVID-19. One of the theories under investigation is that fat cells (adipocytes) act as a reservoir for SARS-CoV-2 and increase viral load in obese or overweight individuals.
In the fight against cancer or chronic infections, the immune system must be active over long periods of time.