If we tumble down a bank and break our leg, we don’t bemoan the weakness of the limb, we accept that we had put it through undue stress. We should regard every part of the environment we subject our bodies to in the same light.
From the literature I read, all modern diseases appear have their origins in environmentally caused autoimmune reactions. As the food we eat is the biggest environmental influence on our bodies, it is to food that we should first address our concerns.
Our formative ancestors ate a miniscule amount of meat. It is only in the past 0.1% of our development (far too short a period for us to make any significant genetic change) that some of us humans have made such a fetish of eating meat and milk. And it is over this period that the burgeoning of cancers and other debilitating diseases has occurred.
The literature shows overwhelmingly that if we revert to the foods that our bodies are developed to use effectively, we will stop putting them under undue stress; they will perform perfectly, as designed.
No matter how effective the advertising for unhealthy foods is, you cannot argue with 4 million years of development.