Time Restricted Eating for Running

February 25, 2021

Time Restricted Eating and Running Performance

Time-Restricted Eating (TRE) is well known for promoting general health and wellbeing, but have you ever considered introducing it to support your running performance? In this episode we delve into the science behind time-restricted eating before discuss the potential PROS and CONS of time-restricted eating for sports performance.

We also outline some questions you should ask yourself to help you determine if it is the correct approach for you.

LISTEN HERE Episode 44: Time Restricted Eating and Running Performance


Time Restricted Eating and Running Performance


Defining Time Restricted Eating before moving on to describe its connection to the body’s Circadian System, which organises metabolism, physiology and behaviour within a daily cycle of circadian rhythms. Outlining the potential benefits to general health and wellbeing including:

  • Insulin sensitivity
  • Glucose tolerance
  • Reduced risk of metabolic disorders including: diabetes, insulin resistance, cardiovascular disease.


“Eat like a king in the morning, a prince at noon, and a peasant at dinner”. Appreciating this quote and analysing how TRE could sit alongside this way of eating.


Explaining how the circadian system works and outlining the various external factors that may influence its function. Factors including:

  • Light
  • Feeding – what we eat
  • Physical activity and its timing
  • Sleep – quantity and quality


Thinking about Circadian System synchronicity and how TRE may help maintain the synchronicity between the 2 parts of the system.


Looking at the potential PROS to running performance from introducing a TRE plan including:

  • Weight loss
  • Energy intake not restricted – beneficial for endurance runners
  • Transient hypoglycaemia – may be reduced
  • Use of fat as fuel – preserving glycogen stores


Moving on to address the potential pitfalls of TRE for running performance including:

  • Loss of muscle mass
  • Poor food choices – energy dense, not nutrient dense
  • Poor endurance performance – in runs over 90mins
  • Stress response – potentially adding to the body’s stress burden


FEMALE FACTORS of hormonal imbalance, pregnancy and stress are reviewed.


Considering how to introduce Time Restricted Eating alongside your running training, but also highlighting the key questions to ask yourself before embarking on this approach to eating. The key questions include:

  • Within how many hours will your eating window be?
  • At what time of the day will you start/end eating?
  • How do your timing decisions fit in with your work/home/family situation?
  • How do your timing decisions fit in with when you train?
  • Will it support my training or hinder my running performance?

Moving on to think about how to introduce TRE into your plan; take it slowly, ensure optimal everyday nutrition is in place first, ensure your food choices are nutrient dense, maybe begin with 14:10 eating window and build up to 16:8.


Time Restricted Eating and Running Performance

  1. Hormonal Imbalance: for female runners with any sex hormonal imbalance TRE may not be an ideal approach due to the potential stress response, which may further disrupt hormonal balance
  2. Pregnancy: Definitely not a recommended approach for any runners who are pregnant due to the additional energy/nutrient requirements of pregnancy.
  3. Half/full/ultra marathon distance: Due to the intensity of training and long distances being run during training TRE wouldn’t be recommended due to the limitations of Fasted State Running, but also the limited ability to take on sufficient energy during the eating window.


Time Restricted Eating (TRE) and Running Performance

1) TRE is only one form of Intermittent Fasting, however it is the one most studied when relating it to exercise and exercise performance.

2) TRE it is thought to be supportive to health and wellbeing principally because of its potential to maintain the synchronicity of the body’s circadian system.

3) Remember, TRE may not be suitable for every runner. Factors need to be considered including:

  • Running distances
  • Current BS control
  • Current stress levels
  • ALSO, current health concerns

4) There are several potential benefits of TRE on running performance including:

  • Weight loss
  • Reduction in transient hypoglycaemia
  • No restrictions to energy intake, so could be suitable for some longer training

5) There are some pitfalls to TRE that a runner would need to consider including:

  • Possible loss of lean muscle mass
  • Potential to over/under eat
  • Potential to make poor food choices
  • Stress response and the fallout from that including inflammation, increased risk of injury and illness.

6) Ask yourself these questions before embarking on TRE:

  • Is this the correct approach for me?
  • Will it support my training or hinder my running performance? (TRE)

Related Episodes:

Intermittent Fasting and the Female Runner

High Stress Poor Performance

Related Resources:


The suggestions we make during this episode are for guidance and advice only, and are not a substitute for medical advice or treatment. If you have any concerns regarding your health, please contact your healthcare professional for advice as soon as possible.

Remember we are available to support you if required contact us at hello@ runnershealthhub.com

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