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Does the "anabolic window" exist?
Few ideas in sports nutrition have had the staying power of the “anabolic window”. Finish training, and you have a brief window of opportunity to consume protein. Miss that window and the recovery response is blunted, adaptation is compromised, and the session somehow counts for less. It is one of the most repeated ideas in applied sports nutrition. This blog highlights that the anabolic window is also one of the most misunderstood concepts in sports nutrition. The importance
Oliver Witard
7 min read


Protein sources for athletes: animal, plant and alternative proteins
The question of "Which types of protein are best for athletes?" is no longer limited to which protein source produces the largest acute stimulation of muscle protein synthesis. In contemporary sports nutrition there is also a second question: "can protein choices that support recovery and adaptation also be more sustainable?" This matters because diet is a major contributor to environmental impact. Estimates often place diet at roughly 20 to 30 percent of annual greenhouse ga
Oliver Witard
7 min read


How much protein do athletes really need?
Is more protein better for muscle building? Is there a window of opportunity? What are the protein recommendations for athletes
Oliver Witard
8 min read


Nutrient timing: Does the "window of opportunity" really exist?
Few ideas in sports nutrition have been as influential, or perhaps as widely misunderstood, as the so-called "window of opportunity". During the 1990s the message appeared simple and compelling: consume carbohydrate immediately after exercise, ingest protein within 30 minutes, and avoid missing the critical recovery window. Over time these ideas became embedded in sports practice. Athletes built routines around them and many still worry that delaying a recovery drink by an ho
Asker Jeukendrup
6 min read


Allostasis in sport
If you have spent any time in elite sport, you will have met the athlete whose decline does not fit a neat narrative. Training looks appropriate on paper, their fuelling is “good enough”, and yet something unravels: performance stagnates, sleep becomes fragmented, mood darkens, minor infections become frequent, and the body starts to feel older than it should. In those moments, the language of sport tends to become diagnostic and disciplinary: overtraining, burnout, relative
Michael Gleeson
9 min read


Why understanding allostasis is essential in elite sport
Most people in sport agree on the basics: athletes improve by training, and “training load” matters. Increase load (sensibly) and you adapt. Increase it too fast, too far, or for too long, and fatigue rises, illness risk creeps in, and performance stalls or drops. Entire monitoring systems, dashboards, and coaching conversations are built around that logic. But there’s a problem hiding in plain sight: we often talk about “load” as if it means training and only training. In re
Asker Jeukendrup
8 min read


Inflammation and health
Inflammation has long been portrayed as something inherently bad; a process that needs to be fought or suppressed. In popular media, it’s associated with pain, chronic disease, and poor health. Yet, within the body, inflammation is also an essential initial component of the immune response. Inflammation is a tightly regulated system that evolved to protect us from infection and promote healing. The problem is not inflammation itself, but when this finely tuned biological mech
Mike Gleeson
6 min read


Iron infusion or injection for athletes
Iron deficiency is a prevalent issue among athletes, which can significantly affect training consistency and performance if left...
Peter Peeling, Nikita Fensham, and Alannah McKay
5 min read


Effects of protein during exercise
One year ago, a very good friend and respected colleague passed away, way too young. Kevin Tipton was loved by many and had a great impact on the field of sports nutrition, especially in the field of protein metabolism. To commemorate the life and the scientific achievements of Kevin, I will make sure a blog goes out every year that highlights some of his research. This time I have picked a popular question that gets asked very often: Do I need to take protein with my carbohy
Asker Jeukendrup
3 min read


A hot tub for bigger muscles?
Should we heat our muscles after exercise to stimulate muscle growth? In a recent blog (see blog post) we discussed some of the research...
Cas Fuchs
3 min read


An ice bath for muscle growth?
You have probably seen footage of well-built athletes such as Usain Bolt, Anthony Joshua, or Cristiano Ronaldo that have immersed (parts...
Cas Fuchs
5 min read


Is sleep quality more important than sleep duration for preventing infections?
Sleep is generally accepted as a focal part of the recovery process for athletes and believed to be important to performance. Many athletes track their sleep and aim to get the recommended 7-9 hours of sleep per night (1). How much we actually need, is not known, and may be highly individual. There is another reason why sleep may be important: anecdotally athletes who don’t sleep well, seem to get ill more often. However, few studies have investigated the effects of sleep qua
Asker Jeukendrup
3 min read


Is it better for muscle building to eat eggs raw?
This questions has been around for many years and even made it to the movie Rocky. No studies were available to confirm or dismiss this...
Cas Fuchs
4 min read


Ice slush: effects, benefits and evidence
Ice slush, or slurry, is a very low temperature (0-1 °C) drink made with blended ice and liquids. Although popular as ‘slushies’ and...
Asker Jeukendrup
5 min read


Making weight in sport
Making weight is a global term for the targeted reduction of body mass, which is purported to enhance performance in aesthetic,...

Carl Langan-Evens
4 min read


Do athletes need fish oil supplements?
In a previous blog we covered briefly what fish oil is and what omega 3 fatty acids are. We also looked at some health claims. Here we...
Nathan Lewis
4 min read


Fish oil: what is it?
Fish oil is a dietary source of omega-3 fatty acids which have been linked to various health effects. Omega-3 fatty acids play a role in...
Asker Jeukendrup
4 min read


Top 5 protein metabolism publications by Kevin Tipton
On January 9, 2022, Dr Kevin Tipton passed away. I have written a tribute (click here) to describe my stories and memories of many years...
Asker Jeukendrup
6 min read


Creatine and its effects on performance
This post describes the effects of creatine on performance. It is simply a summary of current scientific understanding.
Asker Jeukendrup
5 min read


Does overtraining reduce mitochondrial function and glucose tolerance?
A recent paper (1) studied how a progressively increasing training program affected various measures of health and performance. It...
Asker Jeukendrup
4 min read
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