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From the first two parts we’ve lear­ned that we must have a nega­ti­ve ener­gy balan­ce to lose body mass. That the body taps into dif­fe­rent ener­gy reser­ves when in the sta­te of an ener­gy defi­cit and that if we main­tain our power while losing weight, we will go fas­ter, hig­her, far­ther. But what hap­pens then? 

Sin­ce our body has a Plan B and C for pro­lon­ged ener­gy cri­ses, it can endu­re a lot. Unfort­u­na­te­ly, I’m almost wil­ling to say. Becau­se this means that for a very long time we have the fee­ling that we are doing ever­y­thing right and can per­form at a top level, wit­hout rea­li­zing that we are alre­a­dy shoo­ting in our own foot.

Rela­tiv Ener­gy Def­fi­ci­en­cy in Sport (RED‑S)

The tech­ni­cal term for this is RED‑S. A syn­dro­me that descri­bes what hap­pens when the amount of total ener­gy con­su­med is suf­fi­ci­ent to com­ple­te the dai­ly acti­vi­ties, but the body is left with too litt­le ener­gy to ful­ly cover the basal meta­bo­lic rate. The fol­lo­wing list of con­se­quen­ces pro­vi­des an overview:

  • Decre­asing ener­gy stores
  • Lack of concentration
  • Plum­me­ting performance
  • Increased sus­cep­ti­bi­li­ty to injury
  • Depres­si­on
  • Hor­mo­n­al imbalances
  • Mens­tru­al dis­or­ders in women
  • Decre­asing bone density
  • Rest­ric­ted growth /​dis­tur­bed development
  • Dis­tur­ban­ce of body func­tions (gas­tro­in­testi­nal tract, blood ves­sels etc.)

I was able to speak with Prof. Mar­go Mount­joy, IOC and FINA mem­ber and Duke of McMas­ter Uni­ver­si­ty in Toron­to about RED‑S. She has a lea­ding role in rese­ar­ching RED‑S and has published many exci­ting stu­dies on the subject.

Mar­go works as a phy­si­ci­an for various Cana­di­an sports fede­ra­ti­ons in dif­fe­rent weight-cri­ti­cal sports (wrest­ling, gym­nastics, tri­ath­lon, track and field, syn­chro­ni­zed swim­ming) and sees an alar­ming num­ber of ath­le­tes every day who are alre­a­dy show­ing serious signs of long-term ener­gy defi­ci­ts By the time it gets to that point, the eating beha­vi­or is also dis­or­de­red or the­re is even an eating disorder.

Basi­cal­ly, it does not mat­ter whe­ther we are tal­king about pro­fes­sio­nal ath­le­tes or ambi­tious recrea­tio­nal ath­le­tes: a per­pe­tu­al ener­gy defi­cit is poi­son for ever­yo­ne. While initi­al per­for­mance gains are noti­ceable and obvious, after a cer­tain point, per­for­mance suf­fers – whe­ther due to inju­ry, loss of strength, ill­ness, or becau­se the sys­tem sim­ply grinds to a halt. «Star­va­ti­on is never the solu­ti­on in the long run,» says Mar­go Mount­joy, and only by means of enough evi­dence that it’s a short flight of fan­cy with steep crash poten­ti­al we can edu­ca­te and per­sua­de to play the long-game.»

Eat more to lose weight

In this con­text, it is gre­at if you can give ath­le­tes an «aha» moment, when they noti­ce pro­gress by eating more. This can some­ti­mes break through pla­teaus that last for months or even years, resol­ve aches and pains, redu­ce body fat, and so on.

In the 4th part the­re is a big sum­ma­ry and the most important learnings

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Dani Hof­stet­ter –
Per­for­mance Nutrition
Mas­ter of Food Sci­ence ETH,
Nut­ri­tio­nist and Long distance tri­ath­lon world champion