What is the Human Being diet?

Hailed as a transformative way of feasting and fasting, the Human Being Diet joins the list of programmes claiming weight loss and wellness. But how different is this diet and could it be the answer to your weight-loss and energy goals?

In the UK, about 45% of adults are trying to lose weight, and if you’re a woman, you’re more likely to be one of them. No surprise then that when a new diet hits our social media feeds, most of us are all over it!

Enter the Human Being Diet (HBD), created by nutritionist and author Petronella Ravenshear. The diet is supported by a book of the same name and an accompanying cook book. It has a loyal community of Instagram followers who regularly post their personal results, practical tips and favourite recipes.

Read more about popular diets such as the 5:2 diet, the keto diet and the Mediterranean diet.

What is the Human Being diet?

The HBD includes three meals a day using minimally processed, nutrient-dense and anti-inflammatory ingredients. Based on the principles of a Mediterranean diet, it involves eating plenty of vegetables and high-quality proteins, although less fruit and grains.

Unlike certain other diets, the HBD avoids the use of meal-replacement products, such as shakes or bars. The diet advocates health first, allowing weight loss to come as a side effect. It does this by focusing on blood sugar and insulin levels. Doing so helps to balance hormones, reduce inflammation and eventually may lead to weight loss.

The HBD also claims to teach you which foods suit you best, given your unique biology, and aims to reset your relationship with food, including how and when you eat.

How does the HBD work?

The diet claims to help transition you into a healthier way of eating by re-establishing your body’s natural balance, cutting out ultra-processed foods and focusing on nourishing 'real' foods. There are 10 rules and four phases, which take place over three months. Each phase sets out what you should eat and drink as well as the recommended timeline to complete the phase.

The 10 rules of the HBD

1. Eat three meals a day and fast for five hours between each meal, consuming only plain water between meals
2. Begin each meal with a couple of bites of protein and eat one type of protein only per meal
3. No oil or alcohol for the first 16 days
4. No wheat or any other grain for the first 16 days
5. No cardio for at least the first 16 days
6. Drink the right amount of water (about 35ml for each kilogram of body weight) daily
7. Eat one apple per day (with a meal) and only one type of fruit per meal
8. Don’t eat for longer than one hour for each meal (except the weekly ‘treat’ meal)
9. Finish eating by 9pm
10. No sugar, honey or fake sugar, except at your weekly treat meal

What can I eat on the Human Being diet?

You'll be encouraged to eat vegetables and high-quality proteins, such as fish and eggs, as well as essential fats, with fruit in moderation. However, wheat and other grains are avoided during the initial phases of the plan.

Phase one – preparation: 2 days

The first 16 days (that's phase one and two) are viewed as a reset. During this time, food and drinks are severely limited so your diet may fall short of some essential nutrients and be hard to stick to. The aim of this period is to rebalance hormones and reset your metabolic health (how your body processes fats, sugars and other nutrients to produce energy).

During the first two days, you can eat non-starchy vegetables, but you’ll be avoiding oils, grains, dairy and other protein foods, as well as fruit and alcohol. At this stage there is no need to fast for five hours between each meal. The plan also suggests taking epsom salts in warm water 30 minutes before breakfast to minimise detox symptoms.

Phase two – reset: 14 days

Throughout this phase, it’s recommended that you weigh your food so you have an equal ratio of protein to vegetables. You can start to build on the food groups you’re eating, but no oil, grains, sugar, the nightshade family of vegetables (which includes peppers and aubergines) or dairy foods.

This phase focuses on eating three meals a day with a five-hour fast between each one. This allows your digestive system to rest and recover, encouraging your body to burn fat more effectively. You can enjoy an unsweetened black tea or coffee with a meal, but in between meals stick to water only.

Phase three – burn: 10 weeks

Phase three is designed to take place over at least 10 weeks, although some followers stay in this phase until they reach their target weight. You'll now be allowed a tablespoon of olive oil with each meal and a weekly, compulsory ‘treat’ meal that allows for more indulgent food choices.

During this phase you’re encouraged to eat breakfast within one hour of waking. You'll gradually reintroduce the foods you’ve eliminated, while carefully assessing the impact these foods have on your body, so you can determine if the food is likely to suit you for the longer term.

Phase four – forever

Phase four, or the "forever phase", involves integrating the principles of the diet that work best for you. This will help you maintain metabolic balance, energy and wellbeing.

The plan encourages followers to personalise their eating routines based on how their body responded to the earlier phases of the diet, while continuing to avoid foods that 'derail' them, such as wheat, dairy, or ultra-processed foods. You should also continue to avoid all forms of snacking, so that you maintain a fast between meals.

What foods to avoid on the Human Being diet?

You’re advised to avoid eating any food or drink not permitted, until you reach phase four. For example, during phase one and two, you should avoid high-sugar fruits and starchy vegetables, as well as grains, oil, dairy, sugar and alcohol.

One of the most important rules of the diet is to fast for a minimum of five hours between each meal. The reason for this is to support the efficiency of your digestive system, allowing it to rest and process food completely. By incorporating a fast, you may help reduce inflammation, improve the sleep-wake cycle and support gut health. The weekly ‘treat’ meal is considered a key component of the plan because it may help sustain your new eating regime for the long term, plus the additional calories that you’re likely to consume may help to prevent a drop in metabolic rate and a potential plateau to your weight loss.

Is the Human Being diet healthy?

The diet aims to reset the body’s metabolism and balance by focusing on nutrient-dense foods and limiting processed ones. A core principle of the diet is to reduce inflammation and establish balanced blood sugar levels, following which many of its followers report weight loss, reduced joint pain, improved digestion and better energy and sleep. However, the initial 16 days of the diet are extreme and may have negative side effects, although these depend on your health prior to starting the HBD.

One aspect which is not typical of any healthy eating plan is the avoidance of grains. Actually, nutritional guidelines advise we include starchy carbs in our meals, including cereals and wholegrains. In fact, regularly eating wholegrains is association with a reduced risk of heart disease, stroke and cancer, as well as diabetes and obesity. However, the approach adopted by the HBD focuses on a potential link between grain consumption and increased intestinal permeability, more commonly referred to as a ‘leaky gut’. This condition may lead to chronic inflammation and auto-immune disease, although not all experts agree.

What side effects may you experience on the Human Being diet?

Some dieters experience an increase in their cholesterol levels – this should be temporary and occurs as fat stores are broken down. Constipation may also be a side effect, especially during the initial 16 days. Again, this is thought to be a temporary problem as your body adapts to the new way of eating and should resolve as you progress through the phases. During the initial phases of the diet, when food intake is heavily restricted, you may experience light-headedness, headaches and tiredness.

Positive side effects, claimed by HBD followers, suggest improvements to skin, digestion, reduced joint pain, increased energy and better sleep.

What is the evidence for the Human Being diet?

Followers of the HBD offer plenty of anecdotal evidence of its success, however there have been no scientific studies evaluating whether the HBD is effective for weight loss or any other of the cited health benefits. There are studies to support some of the principles on which the diet is based, such as fasting between meals to reduce inflammation and improve sleep, the possible detrimental effect of wholegrains on gut health, and the influence of ultra-processed foods and excess calorie intake on obesity.

Who should not follow the Human Being diet?

The diet claims it is suitable for those over the age of 18, with the exception of:

• athletes
• pregnant and breastfeeding mothers
• those undergoing fertility treatment

However, underweight adults, the frail or elderly, and those with pre-existing medical conditions, including those with renal impairment or kidney disease, should seek advice from their GP. Furthermore, if you have or are recovering from an eating disorder, this diet is unlikely to be appropriate for you.

Does the Human Being diet work?

The HBD is a low-insulin diet and works by focusing on the food you eat, when you eat it, how you eat it and how frequently you eat it. The plan is designed to:

• reduce inflammation
• balance hormones
• re-establish blood sugar control

Anecdotal reports suggest it promotes weight loss, sleep quality and boosts energy levels.

The downsides of the plan include that you’re required to weigh your food, which some people may find inconvenient, stick to set meal times, avoid snacking and drinking anything other than water between meals, and eat in accordance with defined rules. Some dieters may find the initial days overly restrictive and tough to complete. Plus, if you’re a menstruating woman it may be best to schedule these phases during the first two weeks of your menstrual cycle.

Eliminating grains and cutting back on fruit does seem counterintuitive given what most of us understand to be a healthy diet. In fact, you're likely to be lacking some essential nutrients. Importantly, the weekly ‘treat’ meal may promote disordered eating behaviours.

While numerous HBD followers claim to have seen improvements in their health and are happy to share their success online, you should refer to your GP or healthcare professional before starting any new diet to ensure it is safe and appropriate for your individual circumstances.

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All health content on goodfood.com is provided for general information only, and should not be treated as a substitute for the medical advice of your own doctor or any other healthcare professional. If you have any concerns about your general health, you should contact your local healthcare provider. See our website terms and conditions for more information.

Kerry Torrens BSc. (Hons) PgCert MBANT is a Registered Nutritionist with a post graduate diploma in Personalised Nutrition & Nutritional Therapy. She is a member of the British Association for Nutrition and Lifestyle Medicine (BANT) and a member of the Guild of Food Writers. Over the last 15 years she has been a contributing author to a number of nutritional and cookery publications including Good Food.