Nate and Tony on TV
Nate and Tony on TV
Nate and Tony likeness

America’s Most Trusted Dietitian Team

America’s Most Trusted Dietitian Team

Men’s Health Featured On Local 10 News

Articles We’ve Been Mentioned In!

The Best Ways To Protect And Boost Collagen In Skin, According To Dermatologists

As it turns out, the wrinkle-fighting protein is actually worth the hype. “Collagen is the most abundant protein in the body. It’s the major building block of everything from tendons and ligaments to bones, muscles and skin,” says Tony Castillo, Miami-based registered dietitian, nutritionist and co-founder of Nutrition for Performance.”Think of it as the glue that holds everything in the body together,” he tells. 

What is Speed Keto-and Is it a Sustainable Diet?

“Basically, Speed Keto is a hybrid program that combines the traditional ketogenic program with intermittent fasting,” Tony Castillo, RDN, nutrition consultant for RSP Nutrition, tells Health. 

Click the title to read the full article! 

 Do I need to eat protein after my workout to maximize gains?

If you’re trying to build muscle and maximize your gains, should you be eating protein within an hour of your sweat sesh? Well, according to one registered dietitian, it depends. “My first question is: What did you eat before a workout? If the answer is nothing, you need protein to increase muscle building,” says Tony Castillo, MS, RDN, nutrition consultant for RSP Nutrition. “But if you had a protein-rich meal before your workout, it’s not as important to have protein right after a workout.”

Click the title to read the full article! 


Yep, even RDs use BBQ sauce. They’re just picky with the kind they bring home. “Using BBQ sauce is an easy way to transform any dish,” Castillo says. “I always look for a lower-sugar option because it can add up quickly. Some contain as much sugar as a can of soda.” Date Lady makes a great option that’s gluten-free, as well as free of corn syrup and cane sugar.

Click the title to read the full article! 

Does Glutamine Actually Help Crush Your Sugar Cravings?

Eating sugar is a habit. “The memory part of our brains, the hippocampus, helps us to remember the taste of sweets and plays a role in reward-seeking behavior, which pushes us to look for more sugar,” says Tony Castillo, MS, RDN, LDN, registered dietitian nutritionist and nutrition consultant for RSP Nutrition. “Another part of our brains, caudate nucleus, is where habits are formed. So, if you typically eat chocolate after lunch, this will soon turn into a habit. Then, you will continue to look for sugar sweets at this time.”

Click the title to read the full article! 

How to Overcome a Dreaded Weight Loss Plateau, According to Experts

Your body’s natural behaviors aside, there are also some other factors that can keep you from losing weight that have absolutely nothing to do with what you’re eating or how you’re exercising, according to Tony Castillo, a Florida-based nutrition consultant for RSP Nutrition. “You might have been sleeping less or have been dealing with more stress from work or family. Those are both reasons why someone may plateau,” he explains.

Podcasts We Have Been Featured In


Research Presentation

Diaz, N.A., Coccia, C., Dolan, C., Goldsmith J.A., Zourdos M.C. Ad libitum dietary intake habits of resistance trained males: a comparison to established dietary recommendations. Abstract presented at the 2016 Food and Nutrition Conference and Expo, Boston, MA, October 2016.


Research Abstract

Dolan, C., Coccia, C., Diaz, N.A., Zoeller, R.F., Whitehurst, M., Zourdos, M.C. The effects of concurrent strength and cardiovascular exercise programs on ad libitum dietary intake and body composition in young men. Paper presented at the 2016 Energy Balance and Cancer Research Retreat, Houston, TX, January 2016.

Your Team

Sign Up for Our Kick-Start Packet

Our team gives you a FREE walk-through on calculating macros, hydration, and a week of meal prep!