Walter Willett: 2025 EAT-Lancet Commission, Seed Oils & Ultra-Processed Foods

The 2025 EAT-Lancet Commission Update

• 💡 The 2025 EAT-Lancet Commission updates the 2019 report, integrating health and sustainable food systems with new research and a focus on global justice and implementation.
• 🎯 The Planetary Health Diet is a flexible, plant-forward framework, supported by extensive research showing benefits like a 30% reduction in overall mortality and prevention of 15 million premature deaths annually.
• ✅ The diet recommends about two servings of animal-sourced protein per day, with flexibility for omnivores to vegans, emphasizing moderation and diversity.

Dietary Recommendations & Nuances

• 🌱 Key recommendations include increasing nut and legume consumption, keeping red meat intake low (around one serving per week), and prioritizing whole grains over refined grains.
• ⚠️ The report acknowledges that whole grains are not essential but stresses that any consumed grains should be whole, as refined grains are linked to adverse effects and high glycemic load.
• 🍽️ A healthy low-carbohydrate diet can be compatible with the Planetary Health Diet if protein sources are primarily nuts, plant oils, fish, and modest poultry, avoiding high red meat.

Ultra-Processed Foods & Cost

• 🔍 The NOVA ultra-processed food framework is seen as problematic, as some "unprocessed" foods can be unhealthy (e.g., white bread with high sodium), while some "ultra-processed" foods (e.g., whole-grain bread) can be healthy.
• ❌ The focus should be on well-recognized issues like refined grains, excessive sodium, and added sugar, which are often overlooked by the NOVA definition.
• 💰 The cost and convenience of healthy eating are critical, with the EAT-Lancet diet generally not more expensive than national dietary guidelines, but affordability remains a global challenge.

Nutrient Adequacy & Monitoring

• 🔬 The report provides more detailed analysis on nutrient adequacy, noting that diets with less than two servings of animal products per day may risk vitamin B12 inadequacy.
• 📊 Biochemical monitoring is crucial for assessing nutrient status, as intake surveys alone are insufficient due to varying food nutrient content and absorption factors.
• 💊 A food-first approach is preferred, but fortification and supplementation are important safety nets for ensuring nutrient adequacy, especially for nutrients like B12.

Debunking Seed Oil Myths

• 🔥 Seed oils (e.g., soybean, canola) are generally healthy and have contributed to a significant decline in heart disease rates since the 1950s by reducing LDL cholesterol.
• 🚫 The claim that omega-6 fatty acids in seed oils are pro-inflammatory is refutable, with studies showing they do not increase inflammatory factors and often reduce them.
• 🥤 The primary drivers of the obesity epidemic are sugar-sweetened beverages and refined starches, not seed oils, which have been wrongly implicated.
• 🧪 While seed oils are delicate molecules susceptible to damage, industrial processes have largely addressed issues like trans fat formation (now illegal in the US) and other oxidative damage, making them safe for consumption.