Nutrient absorption is the process by which the body absorbs essential substances from food, such as vitamins, minerals, proteins, fats and carbohydrates.

This process occurs mainly in the small intestine, where nutrients are transported through mucous membranes into the bloodstream and delivered to cells, which use them for energy production, regeneration and maintenance of normal body functions. Proper nutrient absorption is crucial for health, because even the most balanced diet can be insufficient if the body cannot effectively absorb the substances supplied. Factors that affect absorption include the health of the digestive system, the presence of appropriate enzymes, the intestinal microbiota, and the way food is prepared.

Some nutrients, such as vitamins A, D, E and K, are better absorbed in the presence of fat, while others, such as vitamin C, improve iron absorption. Maintaining a healthy digestive system, eating the right combinations of foods, and avoiding absorption disruptors like processed foods and excess refined sugars supports the efficient absorption of nutrients, which translates into better health and well-being.