Episode 430: Are Vegans Getting Enough Protein? A New Look at Leucine, Lysine, and More
Apr 25, 2025
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A new study explores whether vegans are getting enough leucine and lysine, with no health issues found in participants. Dr. Kahn highlights top plant-based sources like beans and quinoa while addressing the ongoing protein debate. He also shares insights from recent studies on KETO-CT, the benefits of adding more fruits and veggies to diets, and vitamin D's role in cancer prevention. Plus, discover how both vegan and omnivorous diets can support muscle protein synthesis.
A recent New Zealand study found that vegans consume adequate leucine and lysine without health issues, advancing the plant-based protein debate.
Research indicates that plant-based diets promote longevity and better health outcomes compared to diets high in animal protein, emphasizing their environmental benefits.
Deep dives
KetoCT Study Controversy
A recent study referred to as the KetoCT study raised a lot of debates regarding high cholesterol levels and heart health, particularly among individuals identified as lean mass hyper-responders. Despite claiming that high LDL cholesterol and ApoB levels were not linked to atherosclerosis, the validity of the study has come under scrutiny due to the lack of transparency about the findings regarding soft plaque development. Critics have highlighted that essential results were omitted from the published paper, leading to accusations against the authors for misrepresenting their conclusions. As a result, there has been a notable silence from proponents of high-fat diets in light of this unexpected backlash against the study’s perceived conclusions.
Vitamin D and Colorectal Cancer Prevention
Research has shown that adequate vitamin D levels may play a significant role in preventing colorectal cancer, alongside other dietary factors. A substantial review revealed that diets low in red meat and high in fiber, fruits, and vegetables are protective against the disease, with vitamin D levels above 30 mg per deciliter demonstrating potential benefits. Regular lab checks for vitamin D levels were emphasized to ensure individuals maintain adequate supplementation, particularly for those with limited sun exposure. The findings reinforce the importance of diet and lifestyle in cancer prevention strategies and underline the significance of monitoring vitamin D levels.
Plant-Based Protein and Longevity
Recent studies have indicated that diets rich in plant-based proteins are associated with longer life compared to those high in animal protein. An extensive global survey analyzing dietary protein sources across various nations found that countries with a higher intake of plant protein reported better overall health outcomes and lower mortality rates. The advantages of plant-based proteins are attributed to lower levels of saturated fat and harmful additives present in many animal products, which can lead to adverse health effects. This research highlights the potential of dietary protein sources in supporting longevity and the well-being of individuals while also benefiting the environment.
This week on Heart Doc VIP, Dr. Joel Kahn breaks down a new study out of New Zealand examining whether vegans are getting enough of two key amino acids: leucine and lysine. Using real-world dietary histories, researchers found no health issues among participants—but the debate around plant-based protein continues.
Dr. Kahn dives into top plant-based sources of these essential aminos (think beans, soy, quinoa), and why the ongoing conversation around protein needs and sources matters more than ever.
Plus, he shares insights from three more new studies you won’t want to miss:
Updates on the KETO-CT study
New data on healthy plant diets in African-Americans
Surprising benefits of adding just one more fruit or veggie to your day
The impact of low-carb eating once or twice a week
The crucial role of Vitamin D in cancer prevention
As always, thanks to this week’s sponsor: Endur.com, makers of MegaNatural-BP. Use code KahnMD10 for a discount.
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