Introduction and objective:
Obesity is a state of the body characterized by weight gain due to an increase in body fat due to adipocyte hypertrophy and / or hyperplasia. Malnutrition is a condition resulting from insufficient supply or malabsorption of energy and nutrients, leading to changes in the body composition, reduced cognitive and physical function. The above definition indicates that both people with body weight deficiency and those with excess body weight may be malnourished. The aim of the study is to present the problem of malnutrition in people with excess body weight.

Abbreviated description of the state of knowledge:
Incorrect composing of the usual diet contributes to the deficient intake of vitamins, minerals, proteins and carbohydrates. This may be due to poor eating habits, from consuming processed foods which mainly provide calories without enough vitamins and minerals, or other factors affecting the demand for, or an increased loss of individual ingredients. It should be emphasized that the caloric value of food is not the same as its nutritional value.

Summary:
The paradox of modern times is the occurrence of nutritional deficiencies among the population of countries where the average BMI value is 25–27 kg / m². Unfortunately, often foods that provide an excessive amount of calories do not meet the daily requirements for many basic nutrients, leading to a state of malnutrition, mainly qualitative. Qualitative malnutrition occurs when the applied diet is incompatible with the needs of the body and is most often associated with the lack of a single, exogenous nutrient (specific nutritional deficiency).