How could this little gadget dramatically improve your sleep quality? The Oura ring.

I've been using the OURA Ring (and have been talking about it on the podcast) for quite some time. It's a tracking device that you wear on your finger. It measures your sleep, heart rate, heart rate variability, breathing pace, body temperature, and exercise. And loads of other stuff.

I've found out some very interesting and unusual things using it. Listen on to find out more. By the way, if you want one of the new Oura Rings, use the code ZESTOLOGY to get $$$ off. These new rings look way thinner and less mafia-like than the old ones.

Boosting your brain and body is the theme of today's show, where I've plucked three of the best guests (different format alert) when they go big-time in depth. Their subjects could be dry, but they are so good and knowledgeable that they make it entertaining. 

I love depth, and that's why I've called it the smartest ways to boost brain and body.

• Dave Asprey on Stem Cells (brain and body)
• Dr Pompa on Water (brain and body)
• Todd White on Alcohol (brain and body)

Enjoy getting the old grey matter working hard.

Marek is my personal functional medicine practitioner and one of the most in-demand practitioners in London - almost too much in demand as you'll hear.

Working with him has meant for me: reduced body fat, reduced inflammation, increased methylation, a way better gut. And feeling pretty awesome.

In this podcast - some of the finest supplements to optimise your health. And you'll hear about the one test you should take to establish wellness. It's a good 'un.

Why this podcast? Sometimes it is important to have a little help, and I've found it great to have someone who cares and takes the time to really get to the heart of the problem.

He had the Number 1 book in the world on Amazon in every category for a few days.

Dr. Dale Bredesen is one of the world’s most acknowledged experts on Alzheimer’s, and today's podcast is frankly astonishing. He's seen case upon case over many years of patients who had sometimes advanced neurological decline. And he reversed it.     I am a carrier of the gene that makes Alzheimer’s more likely APOE3/4, just one of the many reasons to interview him. 

Dr. Dale says in his book "Virtually no-one in the future should have to die from Alzheimer’s." That's a big claim. Listen on to find out more.

Challenging conventional wisdom on dietary fat. That's today's podcast guest Nina Teicholz. She's read the science, she's read SO much science!

Nina is an investigative journalist and author of the International (and New York Times) bestseller, The Big Fat Surprise (Simon & Schuster). The Economist named it #1 science book of 2014, and it was also named a 2014 *Best Book* by the Wall Street Journal, Forbes, Mother Jones, and Library Journal, The Big Fat Surprise has upended the conventional wisdom on dietary fat and challenged the very core of our nutrition policy.  She also was a vegetarian for 25 years.

New rules for energy, vitality and motivation. In almost 15 years of being an NLP Master Practitioner and trainer and over the course having written 3 books, I've come across a loot of weird and wonderful hacks for better energy. So on Zestology, we look at the ones that work, the ones that don’t, and the ones you should avoid at all costs.

Today - Dr Andy Galpin. When technology goes bad. Beware of the trackers! Hmm, I like using trackers (as you'll hear), and often have a max geekout on all the stats they give me. But there are ups and downs, trials and tribulations associated with using tracking and tech for better health.

Dr. Andy is a (deep breath): Professor, PhD Human Bioenergetics, Muscle Physiology, Weightlifting, MMA, Scientist, Author and all round top bloke. 

Repeat guest alert! This podcast is all about energy, and I've had lots of questions about a parenting podcast relating to energy, so here it is with my friend, repeat Zest guest and incredible author on parenting, Anna Williamson. An hour in Anna's company is seriously energising! I think you'll agree when you listen.

Anna Williamson is a television presenter, radio broadcaster, life coach, counsellor and Master NLP practitioner. (The NLP link we explore in this show). She is also as you'll hear, 'mind coach'. Anna is also an Ambassador for Mind, The Prince's Trust, The Young Variety Club and Childline.

When you get your breathing right, you'll notice some incredible results. Probably just listening to this will make you breathe deeper.

Brian Mackenzie is a world-renowned strength and conditioning coach. He's trained gold and olympic medalists including, as you'll hear, his wife. He's also a New York Times bestselling author, entrepreneur, and all-round good guy.  

He created Cross Fit Endurance which is wildly popular and has written genuine bestsellers. I loved this chat, and I'm wel jel of Brian's health kit that he's got rigged up in his home. Enjoy!

Happy stomachs feature this week. 

Recently I put something in my weekly blog that became the most clicked on link I've ever included in my '3 zesty things' newsletter (sign up at www.tonywrighton.com if interested). So this podcast is all about my quest to find out why it was such a popular link, why it captured the imagination so much, and why so many people were interested in a link about gut health.

Dr. Zach Bush came up with the concept behind the link. He's a triple-certified so knows a thing or two about gut health. He's a Triple Certified physician, Scientist, Biologist, University lecturer and more. And he made an incredible discovery in his research...

I've been intermittent fasting for a while now and definitely notice the benefits energy-wise. But I'm a proper fasting lightweight compared to today's Zestology guest.

Fasting is a real theme on Zestology, so many experts seem to recommend the benefits of not eating every once in a while. So I got in touch with Loren Lockman. He is the director of the TanglewoodwellnessCenter.com and has been coaching people to better health since 1992, and supervising water only fasts since 1997. He's guided more than 2000 people through water-only fasts averaging 24-25 days and has seen countless "miracles" over the years. 

So what are these "miracles"? Listen on to find out.