The 30-minute diet, also known as the 30-30-30 rule , encourages people to eat 30 grams of protein within the first 30 minutes of waking up and then 30 minutes of cardiovascular exercise. The 30-minute diet, also known as the 30-30-30 rule , encourages people to eat 30 grams of protein within the first 30 minutes of waking up and then 30 minutes of cardiovascular exercise.