How the diets react
Diet Ratings
Butter is pure fat with zero carbs and zero protein. It is the ideal keto fat source and a foundational staple with no restrictions.
Animal product made from milk fat. Explicitly excluded from vegan diet.
Butter is a dairy product, technically excluded by strict paleo. However, butter is primarily butterfat with minimal casein and lactose, making it more acceptable than other dairy. Many modern paleo practitioners include grass-fed butter, though traditional Cordain-school paleo excludes all dairy derivatives.
Strict Cordain-school paleo excludes all dairy products including butter. However, Mark Sisson, Whole30, and most modern paleo practitioners accept grass-fed butter as the casein and lactose content is negligible after clarification.
Butter is high in saturated fat and contradicts Mediterranean diet principles. Extra virgin olive oil is the primary fat source. Butter should be avoided or used only rarely.
Pure animal fat derived from milk fat. Minimal lactose and casein due to clarification process. Universally approved across all carnivore camps including Lion Diet.
Butter is a dairy product and is explicitly excluded from Whole30. Only ghee (clarified butter with milk solids removed) is permitted.
Butter is pure fat with negligible lactose and carbohydrates. Monash University rates butter as low-FODMAP at all reasonable serving sizes.
Nearly pure saturated fat (7g per tablespoon). High cholesterol. DASH recommends vegetable oils instead. No nutritional advantage over plant-based oils for hypertension management.
Pure saturated fat (~7g per tbsp, 100% saturated). Zero protein, zero carbs. Dr. Sears explicitly recommends against butter in favor of monounsaturated fat sources (olive oil, avocado). Inflammatory fat profile contradicts Zone anti-inflammatory principles.
Butter is primarily saturated fat with high arachidonic acid content. Promotes inflammatory markers. Dr. Weil explicitly recommends avoiding butter in favor of extra virgin olive oil. No meaningful anti-inflammatory compounds to offset inflammatory profile.
Pure saturated fat (7g per tablespoon), no protein, high caloric density (100 cal per tbsp), no nutritional value beyond calories. Directly worsens GLP-1 side effects (nausea, bloating, reflux). No place in GLP-1 nutrition plan.
Controversy Index
Score range: 1–10/10. Higher controversy = more disagreement between diets.