stop counting calories and start losing weight

In July 2009, I was asked by Bella (a UK magazine) to comment on 3 ‘fad/mad’ diets – are they really mad, or are any of them OK? The 3 diets were:
1) the Hollywood cookie diet- eat 4 calorie counted, expensive, cookies a day and not much else;
2) the ‘caveman’ diet – eat meat, fish, [...]