There is such a thing as food and such a thing as poison. But the damage done by those who pass off poison as food is far less than that done by those who generation after generation convince people that food is poison.
Avoid fresh meats, which angry up the blood. If your stomach disputes you, lie down and pacify it with cool thoughts. Keep the juices flowing by jangling around gently as you move. Go very light in the vices such as carrying on in society. The social ramble ain't restful. Don't look back. Someone might be gaining on you.