Enzymes

Enzymes are proteins secreted by cells and are found in every cell of the human body.  They are responsible for controlling the rate of reactions and responses that direct, accelerate, slow down or modify all cell functions to supply energy and nutrients for the body.
Enzymes are responsible for:

• Digesting food
• Activating the immune system
• Building minerals into bones

Each organ and tissue have its own special enzyme responsible for the work required.
It is possible to have an enzyme deficiency such as a deficiency of lactase: enzyme for digesting lactose found in milk.  Most people have heard of this enzyme but there are many other enzymes responsible for breaking down other parts of food such as

• Amylases- starch digestion
• Proteases- protein digestion
• Sucrase- sugar digestion
• Papain – general digestive enzyme found in papayas
• Bromelain – general digestive enzyme found in pineapple

And many, others.
When an enzyme is deficient, a person can experience symptoms such as:

• Gas
• Bloating
• Diarrhea
• Gastritis

When foods are eaten that the digestive enzyme required is not present.

Raw foods vs Cooked foods
Raw foods are natural and undiluted.  They offer their pure being without any interference.  They have both metabolic effects on the human body.
A raw foods diet is a very interesting concept and has the potential to be very healthy or healing for those who have congestive ailments.
When foods are eaten in their uncooked, most potentially nutritious state, the vital elements of nature are still in them.  Raw foods diets can be healthy and adventurous, however, unless it is perfectly balanced, it is not good for long periods of time.
It can provide good vitality and nutrient content, but is typically low in protein, calcium, and iron – all of which are essential for overall health and can lead to problems in the long run.
Also, when food is not heated and warm foods are avoided, the body could be come cold.  People in warmer climates do well on these diets because their bodies stay warm from the sun. 
Cooking foods softens the cellulose (enzyme found in food that the body cannot create on its own) and fiber in starchy foods and make their nutrients more available to digest.  In the case of animal meat, although heat in fact toughens the proteins, it helps inactivate bacteria and microorganisms that could cause putrefaction (fermentation in the intestines) and disease.  
Cooking foods makes digestion less stressful and will help those who have digestive issues. 
So, it’s best to have a balance of both raw and cooked foods to maintain proper homeostasis of the body.