The goal of making a vegetarian diet work, according to the discussions in the sources, revolves around selecting foods that are naturally low in polyunsaturated fatty acids (PUFAs) and effectively managing essential nutrients that may be limited in a plant-based approach, while avoiding potential antinutrients and excessive growth-promoting substances.
Here is a comprehensive overview of how to approach a high plant-based diet:
The focus should be on fruits, tubers, and specific fats, emphasizing low PUFA content and high nutrient density.
• Fruits and Tubers: These are considered key components. An example suggested diet composition included one pineapple and a pear. Good quality, consistently available fruits mentioned include pineapples (Del Monte being consistently good) and Caribbean papaya (Asian papaya is considered "iffy").
• Leaves (Greens): Eating leaves is recommended, both raw and sometimes steamed. Raw kale, arugula, and spinach are specifically mentioned. A pound of raw kale alone contributes significantly to daily nutrition.
• Fats: Coconut (oil and whole) is highly favored for its high saturated fat content and low PUFA content (around 1–3%). Coconut is considered the premier tropical saturated-fat source. Whole coconuts provide calories, protein, and fiber.
• Starch/Carbohydrates: It is important to minimize refined carbohydrates and starches. Raw starches found naturally in some fruits and roots are preferred over cooked starch. Potatoes are a natural plant source of protein.
A vegetarian diet can easily meet requirements for most nutrients, but attention must be paid to protein balance, specific vitamins, and minerals.
• Protein Intake: Protein deficiency is noted as difficult to achieve unless consuming refined foods. A balanced protein intake is considered easy to achieve with fruits and leaves.
◦ Nitrogen balance has been shown around 35 grams of protein per day for a 70 kg person.
◦ Plant sources like coconut (13 gm/coconut) and pineapple (5 gm/pineapple) contribute protein, alongside abundant protein in leaves. Leaf protein is chemically similar in nutritional value to milk protein.
• Minimizing Methionine and Tryptophan: Certain plant-based diets, such as vegetarian diets, are beneficial because they are inherently lower in amino acids like methionine, which has been associated with reduced longevity in animal models when consumed in excess.
◦ Tryptophan intake should be considered, as high levels can raise brain serotonin. Tryptophan can be lowered by ensuring adequate intake of competing large neutral amino acids (LNAA). Casein and gelatin provide these competitive amino acids.
◦ Vitamin B12: This is the only deficiency vegans would primarily need to worry about. Bacteria in the human colon produce B12, but whether humans can absorb it efficiently without intrinsic factor is questionable.
◦ Folate: Easily exceeded by consuming leaves. Folate is important for DNA stability.
◦ Vitamin A/Carotene: Green leaves provide extremely high amounts of Vitamin A (as beta-carotene). The conversion of beta-carotene to active Vitamin A (retinol/retinoic acid) is tightly regulated by the body via the carotene cleavage enzyme, helping to prevent hypervitaminosis A, even at high intake levels.
◦ Calcium and Iodine: Daily consumption of leaves can supply the RDA for calcium. When eating Brassica vegetables (like kale or arugula), supplementing with iodine (such as kelp tablets) is recommended to counteract the goitrogenic effects of thiocyanate ions released by these vegetables.
• Polyunsaturated Fatty Acids (PUFAs): Avoiding PUFA is considered essential, as they are negatively correlated with longevity and may increase the rate of tumor growth. Nuts, except for coconut and macadamia nuts (which are low in PUFA), are significant sources of PUFA and should be limited.
• Goitrogenic Vegetables: While general greens are good, certain highly goitrogenic varieties like Russian kale (which has a purple stem) should be avoided because of high concentrations of progoitrin.
• Dairy Concerns (if not strictly vegan): If the diet includes dairy, consumption of standard cow dairy may introduce steroid hormones (like androgens, which can cause acne) and opiate-like peptides called β-casomorphins (which can be addictive). Goat milk/cheese may have less of a hormonal or opiate effect due to different protein and fatty acid profiles.
Vegan and vegetarian diet can increase the survival rate in cancer patients
A vegetarian diet adhering to Ray Peat's principles focuses on minimizing polyunsaturated fatty acids (PUFAs), avoiding hormonal inputs, restricting specific amino acids, and prioritizing easily metabolized carbohydrates and saturated fats
The core diet should consist of fruit, tubers, leaves, and coconut. This diet is primarily carbohydrate-based, relying on fruits and sugars.
Avoid refined vegetable and seed oils; these are sources of PUFAs. Coconut oil is the premier saturated fat and is approved. Coconut oil is highly saturated and low in PUFA.
Focus on achieving maintenance protein levels, avoiding the high methionine and tryptophan loads found in muscle meats. Protein deficiency is nearly impossible when eating whole plant foods. Adequate protein, around 44 grams per day for a standard adult, is met easily with coconut, leaves, and fruit. Methionine and tryptophan should be limited because these amino acids reduce lifespan in rats and are involved in polyamine and serotonin production.
Modern commercial milk contains steroid hormones from pregnant cows. Since dairy hormones are a concern, goat milk or raw cheese might be considered, though alternatives are preferred.
Consume leafy greens for essential minerals and vitamins. Eating approximately one pound of leaves (such as kale or arugula) provides well over the daily requirement for calcium, folate, and Vitamin K.
Raw food typically preserves heat-labile vitamins like Vitamin C and B vitamins
• Cooking should be minimized; steaming is the mildest form of cooking. Boiling can leach vitamins
• If preparing cruciferous vegetables, cooking them reduces goitrogenic potential by about 60% via steaming or 85% via boiling (due to leaching)
• Raw almonds are sometimes problematic; soaking them may aid digestion
This approach, emphasizing fruit, coconut, and leaves, achieves essential nutrient requirements while adhering to the core anti-PUFA and anti-hormone principles derived from Peat-influenced discourse.