I like to eat fruit and vegetables raw. But vegetables I like to steam to soften them up.

Meat? The more rare the better. But you can only eat it rare if it is very fresh. You have a local farm or local butcher with direct farm supply?

Overcooking food is very unhealthy.

The concern around burnt food increasing the risk of cancer relates to the chemicals that form when food is overcooked or burnt: Acrylamide; Polycyclic aromatic hydrocarbons (PAHs) Heterocyclic amines (HCAs) The two most prevalent food groups affected are starchy foods and meat.
Don't overcook your food or burn your toast or tortillas. Keep things fresh.