Today, we bring back one of our favorite episode format: the Q&A. What are our thoughts on weight loss shakes and meal services? How does cortisol impact weight loss? What is our best advice for starting a podcast? And, how can we push through fitness plateaus?

Today we speak to Dr. Walter Willett from Harvard T.H. Chan’s School of Public Health. Walter is the most cited nutritionist in the world. Our conversation goes over some of nutrition science’s greatest successes: the banning of trans fats. We also talk about what the biggest problem in our diet today is, what nutrition science has gotten wrong, why there seems to be so much conflicting information about what to eat, and more.

Today, we speak to world-renowned coach Joel Jamieson about all things cardio. We love to talk about resistance training on this show, but it’s finally time to show cardio some love. Joel tells us all about why cardio is one of the most important activities we should be doing for our health. We go through what the different heart rate zones are, how cardiovascular training is different from resistance training, how you can balance the two, and how cardiovascular training changes your mitochondria.