RED-S deficiency syndromeWhen losing weight becomes dangerous

Carola Felchner

 · 02.01.2025

RED-S deficiency syndrome: when losing weight becomes dangerousPhoto: Georg Grieshaber
In sport, the pursuit of a low body weight has its limits. As tempting as it may be to improve your performance by losing weight, the endeavour should never be at the expense of your health. Losing too much weight is dangerous. We spoke to ecotrophologist Dr Mareike Großhauser about RED-S. The expert advises both top athletes and amateur athletes on nutritional issues and knows how to recognise the deficiency syndrome.

TOUR: What is RED-S, Dr Großhauser?

Dr Mareike Großhauser: In connection with sport, one speaks of Relative Energyddeficit in the Sport, or RED-S for short, when too little is eaten during high training loads. The body is then left with too little energy for important organ activities, meaning that the perceived stress can have far-reaching consequences depending on the duration and level of the inadequate supply.

TOUR: Which ones, for example?

Dr Mareike Großhauser: RED-S is very versatile, as all organ systems can be affected. It can manifest itself in mental discomfort, anxiety, increased stress levels, stress fractures, bone oedema, thyroid dysfunction, increased susceptibility to infections, cycle irregularities, poor regenerative capacity, lack of performance development or insomnia.

In an interview, ecotrophologist Dr Mareike Großhauser reveals why athletes are particularly vulnerable to the risks of losing weight.Photo: Archiv Mareike GroßhauserIn an interview, ecotrophologist Dr Mareike Großhauser reveals why athletes are particularly vulnerable to the risks of losing weight.

TOUR: Who is particularly at risk?

Dr Mareike Großhauser: Anyone who does a lot of sport can be a potential candidate. Inadequate food intake does not have to be deliberate, but can "happen" due to a lack of appetite, lack of time or during the growth phase.



TOUR: What can be done with RED-S?

Dr Mareike Großhauser: Anyone who recognises symptoms should seek support at an early stage. As a rule, gynaecologists or sports physicians will refer you to a sports-related nutritionist. Ideally, interdisciplinary support can be provided with the involvement of a trainer, sports psychologist and sports physician or gynaecologist. With the help of an individual roadmap, which primarily includes an increase in energy intake and optimisation of the macronutrient supply, the aim is to regenerate the body, which - depending on the severity - can take a few months.

Most read in category Fitness