How much protein do we need | Dr Stuart Phillips and Dr Christopher Gardner

Environmental Impact

The environmental impact of protein sources is a significant consideration in dietary choices. Christopher Gardner highlights the benefits of reducing animal protein consumption in favor of plant protein, noting that such a shift can lead to substantial reductions in greenhouse gas emissions and land use 1. He emphasizes that while animal foods are more burdensome on the planet, a balanced approach that doesn't require going vegan or vegetarian can still have a dramatic environmental impact. Gardner also points out that protein storage in the body is limited, and excess protein is not stored but converted to fat, making the choice between animal and plant protein less critical if overall protein intake is sufficient 2.

You don't have to go vegan or vegetarian, but if people, given how much protein they're eating, if they ate less protein and stopped being obsessed with it and shifted the type, you have a pretty dramatic impact on the environment.

--- Christopher Gardner

This perspective encourages a more nuanced view of protein consumption, considering both health and environmental factors.

   

Sustainability Balance

Sustainability in protein consumption involves balancing environmental and health considerations. Christopher Gardner suggests that while plant-based diets may require slightly higher protein intake to meet amino acid needs, they generally provide all necessary nutrients when diverse food sources are included 3. He argues against the obsession with protein, noting that most people consume more than enough, and protein deficiencies are rare even among vegetarians and vegans 4. Stuart Phillips adds that historical dietary practices show the effectiveness of combining grains and legumes to meet protein needs, challenging the notion that plant proteins are inferior.

We've just got to stop saying that plants are deficient or insufficient in certain amino acids, particularly when people eat the type of diets that they do now.

--- Stuart Phillips

This approach underscores the importance of dietary diversity and the potential for plant-based diets to support both health and environmental goals.