Post-Pregnancy Eating for Running - She Runs Eats Performs

Episode 75

Published on:

4th Nov 2021

Post-Pregnancy Eating for Running

Post-Pregnancy Eating for Running

Are you considering getting pregnant or maybe you are pregnant or ready to return to running post-pregnancy? Whatever your situation this topic will give you lots of information and nutrition tips to ensure you return to your running post-pregnancy in a healthy and nutritionally balanced way. 

Even if you have passed the childbearing years you probably have younger women in your family, social, and/or running circles, so you could pass on the information you glean to support THEM in their return to running post-pregnancy…so read on and listen in!! 



What does the research say about post-pregnancy running?

It has to be said that the data is limited and it would appear that the data collated has come from research on elite athletes rather than amateur athletes and physically active individuals.  BUT there is some interesting information come from the current research including:

  • Athletes tend to return to training between 0-6 weeks post-pregnancy albeit the training is reduced
  • Athletes find their performance is the same or better than pre-pregnancy
  • There is an increased risk of stress fracture post-pregnancy
  • Pre-pregnancy weight is achieved after approx. 6months post pregnancy

It is well known that pregnancy impacts the musculoskeletal system so, like the data says, it is important to return to training SLOWLY and build up to help prevent injury. 

How could this be done?

Current recommendations suggest following a programme described as a continuum comprising of three elements:

Return to participation – this is more like rehabilitation training and carried out at a much lower level than before pregnancy

Return to Sport – the athlete can return to their defined sport but at a performance level below that of pre-pregnancy

Return to Performance – the athlete GRADUALLY returns to her defined sport at a level equal to or above her pre-pregnancy level. 

Thinking about endurance sport, there are a couple of additional points to consider when returning to training. These are:

  • Reintroducing training gradually
  • Including low impact endurance sports initially e.g. fast walking, cross country skiing, low impact aerobics
  • This type of exercise is thought to place very little pressure on the pelvic floor therefore can be introduced fairly soon following birth


What impact does Pregnancy have on the musculoskeletal system?

There are many different complaints and potential disorders that a mother could experience post-partum (post-pregnancy) linked to the musculoskeletal system, but also linked to other body systems too. The most common ones include:

  • Pelvic floor dysfunction/pain
  • Lower back pain
  • Weight gain

Pelvic floor dysfunction and/or pain – clearly if there is pain and it is long lasting this would need to be evaluated and addressed before commencing exercise. BUT for any form of exercise a strong pelvic floor is required so, as long as there is no ongoing pain, strength training of the pelvic floor could begin straight after birth.  

Lower back pain – according to one small study the incidence of lower back pain following birth is similar in athletes and non-athletes, however the lumbopelvic region of the back in athletes undergoes significant loading and stress (in most sports) if competing at a high level, so these individuals may be at increased risk of lower back pain following birth.

Weight Gain - post-pregnancy weight loss can be a real struggle for some women…even active women. Clearly there is going to be some weight gain during pregnancy, which is medically known as Gestational Weight Gain (GWG).There is a recommended gestational weight gain, however that will be very individual as it will depend on pre-pregnancy weight, height, foetus size, carrying twins/triplets etc. 

BUT…it is thought that: 

  • If a woman gains over her recommended GWG she is more likely to retain approx. 3kg-4Kg extra weight up to 21yrs post pregnancy…..which is significant 
  • Excess GWG occurs for up to 75% of women who enter pregnancy overweight and for 40% of those of normal pre-pregnancy weight
  • Approx. 25% of women retain more than 4Kg of extra weight 1yr post pregnancy 
  • Approx 20% of women move into a higher BMI 18 months post-pregnancy regardless of their pre-pregnancy BMI 

This post-pregnancy weight gain could potentially put the mother at increased risk of developing chronic health conditions including diabetes and cardiovascular disease, so ideally she would want to try and lose the weight, however in a gradual and healthy way.

BUT, it is important to remember that many new mothers face some unique challenges that might get in the way of them managing their weight during this post-pregnancy period including:

  • Lack of time
  • Lack of motivation
  • Lack of social support
  • Lack of child-care – no family around, husband may be working
  • Low energy – due to sleepless nights
  • Breast-feeding – feeling uncomfortable when running


Another potential musculoskeletal injury that athletes may be susceptible to as they return to training post-pregnancy is Stress Fracture. One study reported 12% of participants (four elite female athletes) experienced 5 stress fractures within the first 6 weeks post-pregnancy. These stress fractures occurred in the sacral area, the toe and the tibia. This same study observed that none of the non-elite athletes experienced any overuse injuries over the first 9 months post-pregnancy. 

Some other facts worth pointing out about the athletes who developed the stress fractures includes:

  • Two of the athletes competed in endurance sports, the other 2 were team ball players
  • They had all returned to high volume sport specific training within 6 weeks post-pregnancy 
  • They were all breast feeding
  • Two had a history of disordered eating

So, this study suggests that the likelihood of stress fracture occurring for most amateur/casual runners is slim, however it would be important to be cautious regarding how quickly you return to running and the amount of training performed whilst breastfeeding to minimise the risk of a stress or other injury/illness. 


Key Nutrients to Consider Post-Pregnancy:

There are many that a new mother would need to consider, however the two being discussed here are Iron and Calcium


As we know iron is important for a runner in:

  1. The production of haemoglobin and myglobin. Myoglobin being the iron and oxygen-binding protein found in skeletal muscle tissue (and the heart) whereas hemoglobin is the oxygen-binding protein found in red blood cells 
  2. The PRODUCTION of red blood cells as well as the production of haemoglobin WITHIN red blood cells 
  3. Immune, cognitive and hormonal health 
  4. The cell energy cycle (Krebs Cycle or Citric Acid cycle) within our cell energy power houses known as mitochondria  

What about Iron status post-pregnancy?

During pregnancy the recommended daily intake of iron increases from 14.8mg/d (for non-pregnant women) to 27mg/d but interestingly some study papers have noted that the average daily intake is as low as 7.7mg/d. Health and nutrition status pre and during pregnancy will determine how a mother recovers post-pregnancy, so in order to return to running as swiftly as possible it is important to ensure that iron levels are optimal during pregnancy. 

A FOOD FIRST approach to iron intake throughout pregnancy and postpartum and beyond would be recommended, however for some individuals a supplement may be necessary. It is highly recommended that you work with a professional when considering supplementation as high dose iron intake, if upper limits are exceeded, could be detrimental to both mother and foetus/child e.g. child neurodevelopment 

Equally iron deficiency could potentially be detrimental to the foetus and/or mother-to-be. For example, if the mother-to-be is anaemic it could increase the risk of:

  • Preterm birth
  • Low birth weight
  • Impaired psychomotor development 
  • Impaired cognitive function

Thinking about the detrimental effects of iron deficiency for the mother-to- be, symptoms experienced may include:

  • Tiredness/fatigue
  • Reduced resistance to infection
  • Headaches
  • Low BP
  • Palpitations
  • Reduced cognition and mood

…and of course all this leading to poor running performance  



The recommended daily intake for pregnant and breastfeeding women is the same as that for non-pregnant women, which is 700mg. 

The body maintains a constant blood level of calcium via a homeostatic control mechanism. This Calcium homeostatic response during pregnancy includes:

  1. An increase in intestinal calcium absorption, which will be directly related to the female’s calcium intake but also her vitamin D availability as Vit D is required for calcium absorption 
  2. An increase in urinary excretion or reabsorption of calcium (where necessary)
  3. An increase in bone turnover - If an inadequate amount of calcium is consumed during pregnancy it could be a major risk factor for the development of stress fracture post-pregnancy due to an increase in bone turnover

The bulk of foetal skeletal growth takes place from mid pregnancy onward, with maximum calcium needs occurring during the third trimester. As a result optimising calcium intake to prevent any detrimental effects to mother or baby would be crucial during this stage of pregnancy. 

Additionally low calcium status is linked to an increased risk of pre-eclampsia and overall child health outcomes following birth.

The overarching message here is; it is very important to consider nutrient status PRE-pregnancy and DURING pregnancy to help limit or prevent any detrimental health concerns POST pregnancy for mother and baby.  


Putting the nutritional advice into practice

Key actions to consider whether you are thinking about becoming pregnant, are pregnant, or have recently given birth:

1) Engage with a professional to ensure you are receiving appropriate advice for YOUR personal circumstances and running goals. 

2) Remember food comes first 

3) Iron Rich Foods to include:

Haem iron – most readily absorbed:

  • Meat
  • Fish
  • Poultry 

But red meat is principle source

Non-haem iron - Not easily absorbed as firstly requires converting to its soluble form

  • Meat, fish, poultry
  • Pant foods eg. Cereals, grains, legumes, fruit and vegetables, eggs, blackstrap molasses
  • Fruit and vegetables include: dried apricots, broccoli, dates, raisins, dark green leafy vegetables/herbs, peas
  • Found in fortified foods

So, unless you are vegetarian or vegan it may be appropriate to introduce a portion of red meat 1-2 x weekly into your meal plan as it is the best source of iron BUT avoid liver as it contains high levels of vitamin A, which may be harmful to an unborn baby. Also, choose natural meats opposed to processed meats and consume organic wherever possible and ensure it is well cooked. 

4) Calcium Rich Foods to include: 

  • Small fish such as sardines – calcium in bones 
  • Dark Green Leafy Vegetables
  • Nuts & seeds such as poppy, sesame chia
  • Dairy: for example milk and cheese 
  • Grains: for example Amaranth
  • Fruits: for example Apricots, blueberries, blackberries
  • Legumes: for example chickpeas, kidney beans
  • Tofu, which has been fortified
  • Other fortified products e.g milk and milk alternatives, bread

Just a word of caution when consuming dairy products in pregnancy and during breast feeding; ensure the choices you make are pasteurised because unpasteurised dairy products may contain listeria, known to cause an infection called listeriosis which, has been linked to a potential increased risk of miscarriage and stillbirth - although the risk is thought to be low.


TOP TIPS for post-pregnancy weight loss:

  1. Try to achieve a healthy lifestyle and appropriate weight status pre-pregnancy to help limit the amount of weight gain during pregnancy
  2. A healthy approach to nutrition AND physical activity provides the best outcome linked to weight loss post-pregnancy - one or the other has limited effect. 
  3. Adequate and appropriate food intake is important so that both mother and baby are receiving SUFFICIENT nutrients.
  4. Know your Energy Requirements including your running requirements AND for breast feeding 
  5. Adjust your daily food intake depending on whether you are exercising or not
  6. Choose low GL foods
  7. Combine protein and CHO at each meal and snack
  8. Remember you could be suffering from a “biochemical imbalance” for example hormonal, digestive, immune imbalance. Seek professional advice to address this  



1) It is important to remember there is very limited research into the subject of post-pregnancy nutrition and running - more quality research needs to be completed

2) Most research to-date has been carried out on elite athletes rather than amateurs but the key outcomes from the research include:

  • Athletes tend to return to training between 0-6 weeks post-pregnancy albeit the training is reduced
  • Athletes find their performance is the same or better than pre-pregnancy
  • There is an increased risk of stress fracture post-pregnancy
  • Pre-pregnancy weight is achieved after approx. 6months post pregnancy

3) There are many challenges women face post-pregnancy that may limit the weight loss they can achieve including: 

  • Lack of time
  • Lack of motivation
  • Lack of social support
  • Lack of child-care – no family around, husband may be working
  • Low energy – due to sleepless nights
  • Breast-feeding – feeling uncomfortable when running

4) There are many nutritional factors to consider for your running post-pregnancy but two key ones are Iron and Calcium.

5) Iron intake needs to increase from 14.8mg/d up to 27mg/d whereas calcium intake remains constant at 700mg/d, however its absorption via the digestive tract increases to maintain homeostasis, 

6) Remember food comes first so increase your daily intake of these key nutrients during pregnancy and immediately post pregnancy

7) To limit weight gain post pregnancy, remember:

  • A Healthy lifestyle and appropriate weight status should be achieved pre-pregnancy to help limit the amount of weight gain during pregnancy, thus assisting in losing the gestational weight gain quickly post-pregnancy
  • A healthy approach to nutrition AND physical activity provides the best outcome linked to weight loss post-pregnancy - one or the other has limited effect 
  • Adequate food intake is important so that both mother and baby are receiving sufficient nutrients

8) Remember we are all individual with individual needs, so if you are having difficulty losing weight or getting back into your running post-pregnancy speak to a Professional

Related Topics:

Eating Enough to Run

Iron Woman

Focus on Calcium


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.

Aileen Smith and Karen Campbell met at as nutrition students (Institute for Optimum Nutrition, London) and became lifelong friends and nutritional buddies! Both have a love of running and a passion for nutrition, delicious food and healthy living.

Together they host RUNNERS HEALTH HUB. A place for like-minded runners who are looking for simple ways to support running performance, energy, endurance, and general great health.

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Aileen and Karen 



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About the Podcast

She Runs Eats Performs
for mid-life female runners of all abilities
Are you confused about the science around nutrition for runners? Listen in to learn about the WHY, HOW, WHAT, and WHEN of eating to fuel your running performance.

We are here to help you translate sports nutritional science, into easy to apply tips and plans, helping you enjoy peak running performance. We focus on the FEMALE FACTORS every mid-life woman needs to know to be a healthy runner.

About your host

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Aileen Smith

Nutritionists, Educators, Podcasters, Runners and Friends

We have a love of running and a passion for nutrition, delicious food and healthy living. She Runs Eats Performs for female runners of all abilities who are looking for simple ways to improve their running performance and their health with nutrition and lifestyle.
We enjoy sharing our nutritional expertise, reviewing the latest sports science and most of all helping you to take easy action so you can enjoy your running life to the full.
We are here to help you achieve great health and good shape whilst staying injury-free with easy-to-understand sports nutritional concepts and easy-to-implement tips and plans.

Aileen and Karen are BANT and CNHC Registered Nutritional Therapists.