I’m in two minds about it at the moment. Firstly, I actually feel pretty good, which I suppose is hardly surprising as I have been eating a super healthy diet with no coffee, alcohol, red meat etc and taking loads of exercise. Secondly, I’m not really sure that I subscribe to some of the more weird and wonderful rules you are supposed to stick to. I mean – why no tomatoes, or bananas (I love bananas)? And why the insistence that it is better to drink juiced fruit and veg rather eating them whole? I was always under the impression that whole was better as more fibre.

Anyway – I have pretty much kept to it, apart from I have to have my ‘solid’ meal of the day in the evening to avoid ending up eating my duvet during the night.

I’ve come up with a meal which obeys the rules and has been my staple (rather than some of the awful sounding recipes in the Clean book). Make a salad with brown rice, chopped celery, chopped cucumber, grated carrot, pine nuts, raisins, peas and sweetcorn (frozen, cooked and chilled). Dress with balsamic vinegar. Serve salad with a green vegetable and a portion of protein (grilled salmon, chicken, sea bass etc.) Tasty and nutritious – but I have to say would be better with tomatoes in the salad….

The drink in the picture is actually very nice. Puree a punnet of raspberries and pass through a sieve to remove the seeds. Add powdered Stevia leaf (natural sweetener) to taste. Add almond milk (vegan) to the puree and blend with a hand blender until frothy. Healthy and low calorie too.

Basically for three weeks you eat a detox diet involving no alcohol, caffeine, gluten, eggs or dairy. You have two liquid meals a day (healthy smoothies not beer!) and one solid meal.

I am always a bit sceptical about diet books in general and ones written by Americans in particular, as I have always found the best way to lose weight could be summed up as ‘eat less, move more’ – but this one has very good reviews and sounds generally plausible. We will see how I get on.