Maimonides — Rabbi Moses ben Maimon, known as the Rambam — was born in Córdoba in 1138. He was a physician, philosopher, and one of the most significant Jewish scholars in history. He served as the personal physician to the Sultan of Egypt.
He also wrote, in extraordinary detail, about how to eat.
His dietary principles appear primarily in the Mishneh Torah and in his medical writings. Reading them today is a slightly disorienting experience — not because they seem old-fashioned, but because they seem current.
What he actually wrote.
Eat until you are approximately one third full of food, leave one third empty, and drink one third of liquid. Stop before you feel full.
This is hara hachi bu nine centuries before Okinawa made it famous. Modern caloric restriction research describes the same principle using different language.
Eat slowly. Chew thoroughly. Give the digestive system time to register satiation.
Eat the heaviest foods at the beginning of a meal. Lighter foods at the end.
Do not eat when stressed, anxious, or in emotional distress. The body cannot digest properly when the stress response is active. This is now understood through the mechanism of the gut-brain axis, but the observation predates the science by almost a millennium.
The Rambam understood the gut-brain connection. He described it as practical observation. We now understand the neurological mechanism behind it. The principle is the same.
On specific foods.
He prescribed wheat bread over other grains. Olive oil. Vegetables. Moderate amounts of meat — preferably poultry over red meat. Legumes. Fresh fruit in season.
He was suspicious of heavily processed foods — heavily salted, over-spiced, cooked in too much fat. Foods that were hard for the body to process efficiently.
He emphasised seasonal eating. Foods that grow in a particular season and climate are, in his framework, what the body in that environment needs at that time.
What the convergence tells us.
The Rambam was working from observation, tradition, and the medical knowledge of his time. He had no access to randomised controlled trials, biochemistry, or nutritional science as we understand it.
What he described maps almost precisely onto what the best contemporary nutritional research recommends. Eat less than you think you need. Eat slowly. Eat real food. Eat vegetables. Limit heavily processed foods. Don’t eat under stress.
When an observation survives 900 years of scrutiny and still holds up, it’s worth taking seriously.
We didn’t need 900 years to figure this out. But it’s reassuring that someone got it right 900 years ago.
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