The 72-hour water fast: your questions answered

Last week I wrote about completing a three day water fast, during which I ate and drank nothing but… water. Since then Ive received messages from people all over the world wanting to know more. Here are some answers to the most frequently asked questions.

Is it dangerous?
Despite fasting having been around for thousands of years, I got a lot of messages from people who were astonished – and occasionally horrified – that someone can go for three days without eating (people can, in fact, go for three weeks without eating, so it isnt all that extreme). I must admit, though, that I did feel like Id achieved something, and since that article people have been inspired to try their own fast.

A common question was whether fasting is in some way dangerous or unhealthy. For anyone considering it, my advice is always to start small, be mindful of how you feel and, if youre in any doubt, think about consulting your GP (especially if you have a pre-existing medical condition). But is fasting inherently dangerous? No.

But neither do I think its a long-term weight-loss solution, or that it will be a good fit for everyone. You need to be careful with your body, and if youre doing something like fasting that will shock it, you should make sure you have access to people who can help if you start to feel unwell. You should also make sure youre doing it for the right reasons – short-term fasting should never turn into long periods of starvation. But at no point did I feel at risk or “unhealthy” – I felt great.

What can you learn?
People Ive spoken to about fasting say they have learned a lot about themselves. People realised their willpower was stronger than they believed, or noticed how much they depended on things like fizzy drinks. They realised they didnt need to eat something – at a work do, for example – just because theres food on the table. They learnt to say no.

One client realised theres no need to completely revolutionise his diet at this point in his life, but discovered he could quite easily eat less throughout the day. Other people noticed improvements in their skin, had better bowel movements, and found it easier to concentrate in long meetings.

I also know a few people who absolutely hated the experience. One of my friends had a headache and a bloated stomach for three solid days. He was miserable. A few felt fatigued and lacked energy to train. Others found it difficult to complete the fast, in part due to their social and work lives, and decided to end it early. There are no right or wrong way to feel about this.

How did you feel afterwards?
Since completing my fast, Ive been monitoring a number of things in my life to see if it really did have a positive effect. In terms of mood, Ive felt great – upbeat and energetic. The fast might not be the only reason, but its certainly a contributing factor. Ive been more productive, too. Were currently opening a new studio at No1 Fitness, and for those of you who have dealt with builders, youll know how much it can take out of you. So my days are busier than normal, but Im getting more done.

Ive been monitoring my sleep using the polar watch, and its quality has improved. Im sleeping for longer, but I am also averaging an extra 45 minutes of deeper, uninterrupted sleep. When I wake early in the mornings, I feel alert rather than groggy (another thing Ive noticed is that my dreams have been especially vivid).

Perhaps most importantly, though, I notice so many more things about my eating habits. Even personal trainers tend to live on autopilot when it comes to food and drink. Since fasting, I pay more attention to what and when Im eating. Ill notice that Im instinctively drifting towards a pastry in a coffee shop and ask myself if Im actually hungry – quite often, Im not.

After dinner, I always used to crave food. Fasting gave me the tools to fight these cravings. Most of us eat habitually rather than out of pure hunger, which can easily lead to over-eating. When you pay attention, you can make small changes that have a positive effect on your life.

Is it a good way to lose weight?
During the fast I lost 3.2kg (6lbs) in just three days. A lot of this could have been water, and many people have told me I was bound to put it all straight back on again. In the three weeks since, Ive put on 0.5kg.

I think people are confusing fasting with “crash dieting”, which often means starving yourself and subsequently bingeing. This, of course, can lead to people putting on more weight than they lost in the first place. The key is being aware of the food you re-introduce after the fast. If you plan the number of calories you consume, you can quite easily sustain weight loss.

Should I do it?
If youre considering a fast, pick three days in your diary when you dont have much on. Dont tag along to restaurants and bars – its not fun watching people eat while you fight waves of hunger.

Train while fasting, even if you think you have no energy – youll get through it and feel so much better afterwards.

Lastly, try to enjoy it – this is about feeling good, after-all.

Harry Thomas is a personal trainer and co-owner of No.1 Fitness. Go to or call 0207 621 1312

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