Hay diet 
noun
A diet in which carbohydrates are eaten at separate times from fruit and proteins, in the belief that this aids digestion.He also maintains a healthy lifestyle, favouring the Hay diet, which avoids mixing proteins and starches in the same meal....
- I also did the Hay diet, which cured arthritis in my feet.
- Food combining has become the hallmark of the Hay diet in recent years.
Origin
1930s: named after William Howard Hay (1866–1940), the American physician who devised it.