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Brian St. Pierre

Meet the Experts

Brian St. Pierre



Brian St. Pierre is the director of nutrition at Precision Nutrition, the coauthor of Precision Nutrition’s Level 1 Certification textbook, The Essentials of Nutrition and Coaching, and the mastermind behind the Precision Nutrition Calculator. He holds a master’s degree in Food Science and Human Nutrition from the University of Maine.

St. Pierre is a Registered Dietitian (RD), Certified Strength and Conditioning Specialist (CSCS) through the National Strength & Conditioning Association (NSCA), and a Certified Sports Nutritionist (CISSN). He also serves on the Men's Health Network (MHN) Board of Advisors.

During his time at Precision Nutrition, St. Pierre has provided nutrition coaching and performance meal planning to US Open champion Sloane Stephens and a host of other professional and Olympic athletes. He’s also served as a nutrition consultant for the NBA’s San Antonio Spurs and Brooklyn Nets and the NFL’s Cleveland Browns.

Prior to joining Precision Nutrition in 2012, St. Pierre was the head sports nutritionist and a strength and conditioning coach for Cressey Sports Performance, a high-performance facility in Hudson, Massachusetts and Jupiter, Florida.

A leading expert in teaching nutrition coaching skills to fitness professionals, St. Pierre has presented hundreds of workshops and trainings in five countries and 17 U.S. states. He’s been featured in US News & World Report, Men’s Health, Men’s Fitness, ESPN the Magazine, Shape, Q Magazine, STACK, and Testosterone Magazine and his insights have been included in stories on ESPN.com, About.com, BuzzFeed, and more.

Twitter: @bspnutrition
LinkedIn: brian-st-pierre-ms-rd-cscs-b2a19519b
Website: http://brianstpierretraining.com/

Articles by Brian St. Pierre, MS, RD

The Ultimate Sports Nutrition Guide for Athletes and Coaches

Get a free PDF nutrition guide for your sport.

The Deep Health Assessment: How’s your health… REALLY?

Physical health isn’t the only kind of health.

Body Fat Calculator & Body Fat Percentage Calculator

Find out your body percentage and how it affects your health.

The “Deep Health” coaching secret that transforms short-term fitness goals into life-changing results

Losing 10 pounds. Running a half marathon. Getting six-pack abs. How do you turn short-term client goals into something meaningful, sustainable, and inspiring? Enter: deep health coaching, the revolutionary method that gets your clients the results they want, plus the results they need.

PN Nutrition Calculator displayed on two tablets.

The Ultimate Macro Calculator

Do you want to lose weight? Gain muscle? Improve health? Boost performance? This free calorie, portion, and macro calculator from Precision Nutrition can help you achieve the results you want.

Nutrition and mental health: What (and how) to eat

No one food or supplement is king.

The traffic light eating method

The traffic light eating method: Diet goldmine—or landmine?

How to eat nutritiously, enjoy your meals, and feel in control around food.

Photo of table full of junk foods, including chips, pretzels, cheesy puffs, caramel corn, and more.

How to eat junk food: A guide for conflicted humans

No foods are off limits!

On the left, a row of fallen wooden blocks resting against the inside of a person's palm. Behind the palm, a row of standing wooden blocks.

“Diet harder” just doesn’t work: Here’s how to REALLY solve the toughest client problems.

How do you help people stop overeating, keep working out, and start getting results? You uncover what’s REALLY holding them back, that’s how.

How to count (and track) macros for fat loss, muscle gain, and better health

If you don’t like counting calories, this might be a shortcut.

‘How much water should I drink?’

The “8 cups of water a day” rule has a few exceptions.

Woman in athletic clothing walking outside using her fitness tracker.

Health and fitness trackers: Do they help… or hurt?

Worksheets are still around for a reason.

Man sprinkling salt on top of meats and vegetables cooking on an outdoor grill.

The carnivore diet: Can it really transform your health?

Will the carnivore diet work for you (or your clients)? We look at the evidence.

Close-up of various hands representing how to use hands to gauge food portions.

Every question about PN’s hand-portion method—answered.

How to handle alcohol, mixed foods, soups, and more.

Ketogenic diet-friendly sources of protein, carbs and fats.

‘What should I eat?!’ The keto diet edition. [Infographic]

Use this guide to build a balanced keto-friendly eating plan in minutes.

Fully plant-based diet-friendly sources of protein, carbs and fats.

‘What should I eat?!’ The fully plant-based diet edition. [Infographic]

This article answers the question, “What can I eat on a fully plant-based diet?!”

Closeup of a woman resting against a window with the sun shining on her face.

“Should I take vitamin D?” Here’s what the science says.

Seems like everyone's taking vitamin D… but should they?

Paleo-friendly sources of protein, carbs and fats.

‘What should I eat?!’ The Paleo diet edition. [Infographic]

How to choose “Paleo foods” that are right for your body, goals, and taste buds.

Mediterranean diet-friendly sources of protein, carbs and fats.

‘What should I eat?!’ The Mediterranean diet edition. [Infographic]

Learn how to make Mediterranean diet choices that are “just a little bit better.”

Closeup of an outstretched hand holding a phone with the Precision Nutrition Weight Loss Calculator displayed on screen.

Precision Nutrition’s
Weight Loss Calculator

This weight loss calculator (based on the NIH Body Weight Planner and adapted from research collected at the National Institute of Diabetes and Digestive and Kidney Diseases), factors in how your metabolism really works to predict how long it’ll take to reach a particular weight loss goal.

Plant-based sources of protein, carbs and fats.

‘What should I eat?!’ How to choose the best vegetarian and plant-based foods for your body. [Infographic]

Start making better choices, whether you’re browsing the grocery store aisles, cooking a homemade meal, or ordering from a menu.

Closeup of hands cracking an egg into a pan on the stove.

The Paleo diet: Your complete how-to guide.

Find out if the Paleo Diet is right for you.

Man spooning food from a bowl onto a plate at the kitchen table.

Plant-based nutrition: A complete guide for vegetarians, pescatarians, flexitarians, and more.

This article will clear up the confusion around plant-based diets.

Collage of question marks in speech bubbles against a yellow background.

Best diet quiz: How’s that diet REALLY working for you?

This 16-question quiz helps you figure out whether a dietary approach is a good fit—allowing you to feel good, perform in the gym, eat out, and remain connected to friends and family.