Dr. Johnny Lovewisdom taught me the spiritual value of avoiding fats for a selected period of time with his Vitarian Diet. Lovewisdom himself attempted to completely eliminate fats from his diet by swearing off all avocados, nuts and seeds (see his book Spiritualizing Dietetics: Vitarianism). He eventually introduced goat's milk (pure fat) into his diet into his diet (see Viktoras Kulvinskas' book – Life in the 21st Century) - which justifies the conclusion that fats are essential.
This kind of fat-free diet can allow one to reach a tremendous, though passing, high. One must be careful with such lean diets in the long term as pollution in food, air and water makes the nerves more susceptible to damage when fat is absent in the diet. Also, mineral deficiencies, omega 3 fatty acid problems, and vitamin B12 issues may, over time, make their appearance with such nutritional approaches.
Because the desire for fat (and its insulation) increases the closer one is to civilization (pollution), this type of spiritual diet is heightened when one is living in Nature – far away from toxicity.