Dg800,
Please take this into consideration: millions of years ago, the earth was 'born' (use whatever term is suitable for you); first were plants then animals then mankind (some kind of animal too). Nature has had time to perfect many, many details in everything on earth. Why would man think he can do it better since about 100 years or so.
Diabetes and cancer and obesity have skyrocketed in the last 30 years. Cancer and diabetes were very rare 100 years ago, what has changed since? My grandmother didn't know what a supermarket, a fridge, a microwave oven was, did it matter? She lived till she was 92, her mother till 98. Industrialized food and modern allopathic medicine are probably partially to blame.