i want to start on a diet, do you know anything that could help me ?
Well the word diet implies the use of certain intake of nutrition for health or weight management. Which are you aiming for?
weight management 
Dietary habits and choices play a significant role in quality of life and health. It will be more of a lifestyle change to lose weight.
i can see that, what else can you tell me
A lot of people go with vegetarianism. Buddhists usually are but depends on their sect. Would you consider it? They are said to be one of the healthiest groups  
yea i would consider it.. sounds like i should look into it more
Many people choose to not eat food from animal sources in varying degrees. Just remember to get enough protein or just up your fruit and veggie intake.