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As with all big changes to your normal diet and routine, there can be side effects. Some people will not experience any side effects, but a few will find the side effects to be so uncomfortable that they will be unable to continue with the diet.

Some of the side effects seem to occur only when fasting is first attempted. These effects, such as headaches and dizziness, will diminish and hopefully disappear altogether over a period of several weeks.

Dehydration seems to be a common side effect of following the fasting diet that doesn’t fade in time. It is easily dealt with by sipping plenty of water or other low-calorie drinks regularly throughout the fasting day.

What about irritability? Yes, some of us do get grumpy when we are feeling hungry. This does seem to reduce as we get used to fasting. But I can get grumpy on fast days and normal days too!

Some people report difficulties sleeping due to hunger and daytime sleepiness. This is less common than other symptoms. Most people feel a buzz of energy during their fasting days. Difficulties sleeping can occur, particularly if you eat the majority of your calories during the early part of the day. Increasing the size of the evening meal and making sure it is rich in complex, filling carbohydrates helps the body feel sustained until after we go to sleep.

Finally, here’s one side effect that has affected me. I’ve been feeling the cold all through the winter, but particularly on fasting days. It has been a rather cold winter this year, but I have been suffering more than I would expect. The result has been an increased wearing of jumpers – perhaps two or three at a time and a higher heating bill. I take comfort in the fact that this is likely to mean that my body fat is reduced and the diet is working well.