paradox saidControlled use of fire by hominids actually predates the existence of humankind by many hundreds of thousands of years, so it's not like cooking food is some very recently introduced dietary variable in human nutrition.
Exactly, it is believed that this is why we evolved to have a relatively short digestive tract, small waist and walk on two feet. When you cook the food it becomes softer and you allow more of the nutrients to be absorbed into your body (>90% vs around 50% for raw food) so less surface area is necessary for our bodies to absorb the nutrients in comparison to a chimp and allows our body to expend less energy to absorb these nutrients.
I'm not a big fan of the raw food diet, since it seems to be going against what our bodies have evolved over millions of years to achieve. That said, if somebody wants to live like that, to each his own. However, a logical connection can't be made between cooking and the prevalence of illness and disease in humans. Heart disease and heart attacks is more due to the types of food we eat, such as high fat, high sugar, high salt, and the stress in our lives, and humans live longer than most other animals so we are going to be more likely to get diseases like cancer.