For as long as I can remember I've wanted to be old.

That might sound like a strange life ambition, but it's one I've taken rather seriously -- and it lead me to embark on a quest to find the ultimate diet to help me get there.

The Indigenous Hunza people in the hills of Pakistan don't eat until lunchtime, existing on a mostly raw diet of fruit, nuts and seeds with a little yoghurt thrown in. There is one cooked meal per day -- dhal with wholemeal chapattis.

Every single night.

This has been my diet for the last four weeks.

It was what will be forever known as the month of bliss.

After four weeks on the super restrictive Okinawa Diet, the next on my list of centenarian tried-and-tested eating plans was that of the Seventh Day Adventist poster girl Marge Jetton, who lived to 106 on a wholefood vegetarian diet. The rules to follow were (kind of) simple: don't eat things that are bad for you, and don't eat animals.

I've just spent the last four weeks eating seaweed, bitter melon, leafy green vegetables, tofu, fish, a little brown rice and more sweet potato than anyone could consider normal. I've become used to miso soup for breakfast, drinking nothing but green tea and water, and adjusted to the Okinawan mantra of only eating until I'm 80% full. I've also spent a large percentage of the month being totally, utterly miserable.