By: Lara Baudains 

What was once coined as the month to abstain from alcohol, January is fast taking on a new name–Veganuary. Find out how you can make the most of your health and diet and get your body 'baby ready'!

Veganuary is a non-profit organization encouraging people to adhere to a plant-based diet for the month of January. With global participation in this challenge doubling year on year and supermarket chains and celebrities endorsing the vegan and vegetarian lifestyle, it’s important to be aware of the impacts adhering to these eating patterns can have on your menstrual cycle and therefore fertility.

A plant-based diet has a plethora of benefits for our bodies, the environment, and animal welfare but when it’s not planned properly, problems can arise. A change in dietary eating habits can affect the body in numerous ways both positive and negative. So whether you’re looking to put your tastebuds to the test for these 30 days or you’re looking to change your diet long term, there are a few things I feel you ought to know so that you can make educated choices for your body, whatever the month!

Cycle Length and Ovulation

The length of a women’s menstrual cycle can vary enormously from person to person and from cycle to cycle, due to a variety of factors. There is some suggestion that cycle length may vary in those adhering to a plant-based diet. These variations can include longer cycles, shorter ones, or completely absent periods, however, studies demonstrating the correlation to vegan diets are limited. What’s more, it’s important to remember that long cycles and absent ovulation may also result from conditions such as PCOS, thyroid disorders, and perimenopause, to name a few.

Why can plant-based diets affect your menstrual cycle? Well, there could be many reasons for this but the main one is that the average plant-based diet is lower in calories than an omnivorous one. A sustained calorie deficit can be read by the body as starvation, so your body tries to conserve energy wherever possible. This may mean switching off ovulation to avoid any chances of getting pregnant, resulting in irregular cycles. Reproduction is not seen as essential by the human body, and if your body feels under threat in any way, it will move into fight or flight mode where your sex hormones will be forced to take a back seat. 

By avoiding excessive exercise and including calorie-dense foods such as nuts, seeds, avocados and olive oil if you’re eating a vegan diet, you can help to avoid any energy imbalances and prevent your cycles from changing too drastically. Every woman’s body and cycle is unique so if you are wanting to experiment with your diet at the same time as trying to get pregnant, working with a professional nutritionist is advised.

Managing PMS symptoms through balanced hormones

Mood swings, headaches, cramps, feelings of anxiety, greasy skin and breast tenderness are just a few signs of premenstrual syndrome (PMS). Some people suffer from all of these symptoms, others just a few and for some women, they experience none at all. When your hormones are working optimally, PMS should be mostly non-existent. Progesterone, the dominant hormone following ovulation, is the calming, mood-stabilizing, sleep-promoting hormone that helps to ensure healthy bones, shiny hair, supple skin, and strong nails. 

If you’re not ovulating regularly you might be feeling a little out of balance or, if you are ovulating but dealing with excess estrogen or a short luteal phase, that’s when PMS can set in. Evidence is emerging of links between decreased PMS symptoms and predominantly plant-based diets although it’s early days.

Why is this? Although the exact reason as to why PMS occurs is not fully understood, the decline in estrogen and progesterone in the last few days of your cycle almost certainly plays a part. As the food that we eat can affect our hormone levels, it’s important that we pay close attention to our diet whether we include animal products in it or not.

Be aware of nutrient deficiencies

Regardless of your eating habits, if you have heavy periods you can be at risk of nutrient deficiencies. Now combine that with a vegan diet that doesn’t account for missing vitamins and minerals and you’re putting yourself at serious risk. It is important to be aware of nutrient deficiencies when trying to conceive and I’d advise you test, don’t guess. There are numerous companies that allow you to test various vitamin/mineral/hormone markers using a simple finger prick test at home.

Iron is a nutrient of concern for many women, with some studies suggesting that iron deficiency is just as common in those who have meat in their diet than those who don’t. However the issue with the vegan diet is not the amount of iron but instead the type.

Why is this? A vegan diet is higher in non-haem iron whereas a diet containing meat is higher in haem iron. Non-haem iron has a lower bioavailability than haem iron meaning it’s not absorbed as easily by the body, putting you at risk of iron deficiency anemia. When adhering to a vegan diet however there are ways you can help increase this absorption such as combining your iron-containing foods with Vitamin C and avoiding having them with inhibitors of iron absorption such as phytic acid, zinc or calcium.

More scientific research in the general public over longer periods of time needs to take place to draw comprehensive conclusions as to whether the vegan diet is better or worse or for your menstrual cycle. However, whether you’re going all out for Veganuary this year or you're simply reducing your meat intake the best thing you can is to educate yourself on how to eat a vegan diet the right way and avoid deficiencies.

Why tracking your cycle is important when making dietary changes

By using OvuSense to reliably track your cycle, using live, core body temperature data analysis, you’ll be putting yourself in the best position possible when it comes to trying to conceive. OvuSense allows you to track any changes to diet and lifestyle by enabling you to access daily data on your body and menstrual cycle. This allows you and your nutritionist to see how changes are affecting your cycle but also introduce supplements where needed to maintain a regular, healthy cycle. 


About Lara Baudains

Lara is a qualified nutritionist, personal trainer, health writer and product developer based in London. Registered with the Association for Nutrition (ANutr), she has carried out a Bachelor’s (BSc) degree in Biomedical Sciences and a Master’s (MSc) degree in Nutrition. She is also a level 3 qualified personal trainer and currently works as a freelance nutritionist as well as the Head of Nutrition and Product Development for a leading London-based supplement company.

If you’d like to find out more about her work, head to or @lara_nutrition_ where you can work together to boost your fertility through diet.