When we talk about undernutrition, we are not talking only about stopping the diet. Undernutrition is much broader and concerns both people who are no longer feeding, lack of appetite or fear of growing up (anorexic), but also those who feed poorly - it is called malnutrition - and people suffering from weight loss due to certain pathologies that accelerate the metabolism (severe infectious diseases, cancers ...).
As stated by Dr. Laurence Plumey, nutritionist and author of the Great Book of Food Editions Eyrolles, it is not because a person is skinny that it is malnourished. The case of an overweight or obese person who loses a lot of weight is equally disturbing.
Undernutrition is therefore to be taken very seriously because, not only can it reveal a serious health problem but, moreover, the loss of weight due to undernutrition is at the expense of muscle mass and causes fatigue, deficiencies, drop in immune defenses and aggravation of underlying pathologies, if they exist ...
One might think that undernutrition is only a problem in developing countries. However, undernutrition is present in Europe: between 5 and 10% of the European population is malnourished.
It is especially in health facilities (hospitals, Ehpad * ...) that we find the most patients suffering from undernutrition: on average 20% of hospitalized children; 45% of adults and 60% of elderly people hospitalized or living in an institute (2003 figures). These proportions vary, of course, depending on the type of pathology that these people suffer from.