While working at an ayahuasca retreat center I did several very long traditional master plant diets. This is a very restrictive diet (no salt, oils, sugar, spices, usually no fruits or green veggies. Very bland food- oatmeal, rice, quinoa, beans, lentils, plantains, fish). Some days you wake up starving only to find yourself unable to stomach a bite of oatmeal. Some people have a really hard time with it for a couple weeks or less. After a few months I surprised myself actually looking forward to eating a big bowl of unsalted, unspiced lentils. Yum!