The Pritikin diet is a low-fat, high-fibre diet which forms part of the "Pritikin Program for Diet and Exercise", a lifestyle regimen originally created by Nathan Pritikin.The diet is based around low-fat, high-fibre food and limiting red meat, alcohol and processed food. When it was launched the diet was considered radical, but its precepts are now considered largely in alignment with mainstream nutritional advice. The Pritikin Diet has been categorized as a fad diet with possible disadvantages including a boring food choice, flatulence, and the risk of feeling too hungry.Gastroenterologist David Hershel Alpers and colleagues described the Pritikin diet as "nutritionally adequate, but the low fat content makes it unpalatable, and the likelihood of compliance is low".