I've been living in Japan for a few months now, and since coming here my diet has consisted of four major food groups: carbohydrates, other fried stuff, cigarettes and canned ice coffee. It was somewhere between the fifth and sixth floor stairwell of my building that I decided my diet needed to change, and I needed to sit down.

Perhaps now was the perfect time for trying something that has piqued my interest for years — fruitarianism. It's not new, YouTube is full of advocates of the diet and the late Steve Jobs practiced it on and off. He even came up with the name Apple during a spell of fruitarianism. Would eating nothing but fruit for a week improve my energy levels and spur a similar eureka moment of inspiration? Or would it leave me nothing more than tired and irritable? There was only one way to find out.

Day 1, Sunday: 63.2 kg