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Build more muscle and lose more fat with science.

Get the latest research on muscle gain and fat loss, and learn how to apply it to maximize results.

  • Interactive mobile-friendly color PDF covering 8 studies related to muscle building and fat loss each month

  • Information presented in an easy-to-understand and practical fashion, even if you don't have a science background

  • Access to an archive of nearly 300 video and written research reviews, evidence-based guides, and Q&A's

Keeping up with the research is tough, so let me do the work for you.

Hundreds of exercise and nutrition studies are published in scientific journals each's impossible to keep up.

There's too much to sift through. Nobody's got time for that! But being educated in the science is important if you want the best results possible. So how do you get the information you need without spending hours and hours? And how do you distinguish good information from misinformation?

That's where the Weightology Research Review comes in.

Each month, you'll get 8 studies related to muscle building and fat loss. I break everything down for you, so you don't need a PhD to interpret the data.

You get exactly what you need: the important details of each study, and how you can take the study's results and apply it to the goals of gaining muscle and losing fat.

Here's what you get...

  • Coverage of 6-7 new studies on muscle gain and fat loss each month. I go over the reasons for the study, the methods, the results, and what the results mean to you. I'll discuss it in the context of other relevant research and where the weight of the evidence lies. I give you practical takeaways to apply to your own training and nutrition or that of your clients.
  • Coverage of 1-2 "Past Blast" studies each month. Meaningful studies don't have an expiration date. It's important to revisit past research so that you have as much knowledge as possible to enhance your results.
  • NEW! Interactive, mobile-friendly, visually attractive color PDF. Read on the go with your phone - no annoying pinching or zooming. The Weightology Research Review is designed for mobile and desktop. It's easy to navigate, has hyperlinks to relevant research, and full-color graphics to make it easy to follow.
  • Topics relevant to you. Every reviewed study has practical relevance to how you train and eat. You can take the information and start applying it right away.
  • Something for everyone. Are you trying to gain as much muscle as possible? Are you a competitor prepping for a show? Are you a trainer or dietitian working with clients with obesity? Are you trying to lose weight? Every issue has content that will help you.
  • Evidence-based guides. Sometimes a single study can't tell you everything. That's why you also get complete evidence-based guides covering all the research on broad topics including training volume, training frequency, intermittent fasting, etc. Plus, the guides are continuously updated through the year as new research becomes available.
  • Access to all past PDFs and an archive of nearly 300 video and written research reviews, mini-webinars, and Q&A's. Research review content prior to November 2019 was web-based, with a variety of written and video research reviews, mini-webinars, and Q&A's. Written content can be converted to PDF with the click of a button. Videos can be streamed or downloaded, and PDFs of slides are available.
  • Access to a private Facebook group. Get direct access to me and ask me your specific questions. Plus, you'll be surrounded with other like-minded members and grow your network.
  • Content organized by topic and month. It's easy to find what you're looking for. The website search button also works for finding specific topics.
  • Ability to cancel your subscription at any time. No hoops to jump through. You can cancel any time.

Want a list of all available content in the Research Review?  Click here.

Want some sample content before you buy?  Get your free Research Review content here.

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James Krieger is hands-down one of the top evidence-based practitioners in the fitness field. He not only possesses terrific knowledge of the literature, but his involvement "in-the-trenches" allows him to provide keen insights into the practical implications of training and nutritional strategies. He's always a go-to source for trusted, scientifically grounded info.Brad Schoenfeld, PhD, Author: Science and Development of Muscle Hypertrophy


James’ research review has long been a staple in my monthly professional reads.

As a fitness professional, there is a constant pressure to keep up to date with the research if I’m to answer client questions with confidence. But now, more than ever, bold claims are thrown around without evidence, or with a few cherry-picked studies claiming support. With over 1000 studies published each month relevant to my field, looking through all the research is impossible. Further, can I be trusted to check my own biases when reading? I’d like to think so, but I don’t think I can. This is where subscribing to a few carefully chosen research reviews has proven invaluable. James’ Weightology Research Review is one of those I turn to each month. It helps me to stay relevant and at the top of my game. And the resulting confidence my clients have in me means better-executed plans, which leads to the results I’m known for, and my continued popularity as a coach.

I can’t recommend it highly enough. - Andy Morgan, Fitness Writer and Online Coach,

James Krieger was one of the hidden gems of the fitness world when I was coming up. Honestly, when I read his now infamous series on insulin and body composition measurements, I felt like I had found a secret cache of knowledge that advanced my understanding of nutrition and body composition change more than the last 20 articles I'd read combined. Not only is James formally educated in both exercise and nutritional science, he has been in the fitness industry for years, he walks the walk, and he understands the ins and outs of the science because he himself is a published exercise and nutrition scientist. Not only has he published, he's published some of the most foundational journal articles in our field helping to establish fundamental relationships between exercise variables with hypertrophy and strength, and nutritional variables with fat loss and muscle retention. Reading weightology is not just a way to learn information, but a resource to help you learn how to think. I credit much of my critical thinking development from learning by his example and I proudly give weightology my highest recommendation. - Eric Helms, MS, CSCS, 3D Muscle Journey

James Krieger is probably the best kept 'secret' in the fitness industry. Not only is he incredibly bright at reading and interpreting research but he is also able to relay that research to other people in an understandable manner. Further, he does an excellent job synthesizing conclusions and recommendations from multiple studies and in my opinion his website is one of the best places to get information in the fitness industry. I highly recommend his research review. - Layne Norton, PhD, natural pro bodybuilder, Biolayne LLC

James not only has the most up to date information on all things weight loss, muscle building, and fitness, but his reviews are unmatched in terms of detail and practicality. - Spencer Nadolsky, D.O.,

The Weightology Research Review is one of my favorite resources to dig in to (and recommend to others!). Not only are the studies chosen relevant and interesting but James has a unique ability to give deep insights that could go undetected. There is a perfect balance between the deep level of nuanced detail that is given with clear, pragmatic conclusions that connect the research to practice. For anyone looking to make better decisions about training and nutrition through science, then the research review is an excellent resource. - Danny Lennon, Sigma Nutrition

I've subscribed to Weightology for years. Aside from having his own published work, James does a fantastic job of reviewing studies. His work is clean and approachable, and that's not a small compliment because reading research is a skill and art of its own. Weightology is great for enthusiasts learning more about their bodies or professionals building their skills—especially for professionals in a fast-growing industry. If you want to stay at the top of your game, educational resources like Weightology will definitely help you get there. - Leigh Peele,

As a coach of physique and strength athletes and being a competitive bodybuilder and powerlifter myself, Weightology has revolutionized my practice. James’ research review is not only the most comprehensive break down of the science of body composition, but is easily digestible and done so in a manner that allows me to apply the best evidence to my clients and athletes training and diet. If you are serious about getting the best results and staying up-to-date with the science, you’d be a fool not to invest into Weightology! - Jacob Schepis, JPS Health and Fitness


Some of my closer friends know that I've been doing a lot of reading about nutrition and fitness during the last year and a half or so (in addition to curling in the squat cage). In my not-so-humble opinion there's a lot of bullsh*t out there, so it's good when you can find research based, reliable information. I've got a very small list of what I consider to be outstanding resources, one of which is James Krieger over at I'd highly recommend reading his material if the topic interests you. - Patrick Umphrey, Powerlifter, Eat Train Progress Coach

Again thank you so incredibly much for your service, as a Certified Sports Nutrition Advisor and natural bodybuilder I'm constantly attempting to explain things through science and having your unbiased opinion lay out the info in layman's terms while providing MANY scientific references is a gift from the heavens. - Jameson Wolff, BCRPA, CSNA, Jameson Wolff Fitness Systems

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The volume bible is SO good. It has to be the most comprehensive volume related resource online.

- Brian Minor, MS, CSCS

I subscribed initially to just read your volume bible, and have to say it's the most in depth piece on volume I've ever read having been in this industry for over 25 years.

Having only scratched the surface, I'll be staying a member.

Absolutely fantastic work, and I appreciate you bringing this information to light.

Here's to your continued success and discoveries, and making the fitness industry a better informed place to be.

- Lee H.

Your content is amazing. I think not enough people are aware of the quality compared to other well known research reviews.

- Marco S.

I loved your critical and thorough analysis - your critical thinking skills are superior to most health/fitness "gurus." You set the standard when it comes to nutrition research and analysis!

- Daniel F.

I have recently signed up for the research review and just wanted to say thanks, it is excellent, looking forward to future content...

It is so underrated...I'm blown away by the amount of data in there

- Jeff K.

James Krieger's Research Review is a MUST to invest for any serious professional.

- Andreas K.

Great content as usual! The review on ultra processed food is solid.

- Luis V.

Love this month's edition. Especially the data on 12,000 steps. Powerful man.

- David W.

Love your stuff. World class.

- Calvin H.

I just subscribed to weightology today! Absolutely love it so far!

- @i_aim_to_misbehave82

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