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Natural Awakenings Westchester / Putnam / Dutchess New York

Our Bodies Know Best: Using Nutrition Response Testing, Dr. Louis Castaldi Targets the Root Cause of Chronic Symptoms

Dr. Louis Castaldi at work in Eastchester, NY

What if our bodies could tell us exactly what’s causing our health problems—and exactly what’s needed to fix them? That’s the idea behind Nutrition Response Testing (NRT), an advanced form of applied kinesiology that helped restore the health of Louis Castaldi, D.C., and that he now uses to help people struggling with chronic illness.

The owner of Holistic Health Care, in Eastchester, Castaldi is a holistic chiropractor, certified applied kinesiologist and advanced clinical training graduate of NRT. He’s been in practice since 1998. 

In 2005, Castaldi was diagnosed with irritable bowel syndrome. He had suffered from IBS symptoms since he was a child. In his early 30s he attended a workshop in NRT taught by its founder, Freddie Ulan, D.C. 

“NRT is an advanced form of applied kinesiology that allows the doctor to hone in on the underlying causes of most health problems and what specific supplements and dietary advice are needed to improve them,” Castaldi says. “I volunteered to be tested by Dr. Ulan and didn’t tell him about my digestive problems. Using Nutrition Response Testing, he was able to determine that I had digestive problems, what the underlying causes of my IBS symptoms were, and specifically what supplements and dietary changes I needed to make in order to fix a lifetime of suffering from this debilitating condition.”

Within two days of taking the supplements and reducing his dairy and sugar intake, Castaldi says, he didn’t have the urgent need to run to the bathroom in the middle of eating a meal. That was the first time that had happened in years. 

“I was amazed by my own healing response, and that this type of testing could identify what was wrong with me and what supplements would work for me,” he says. “This revelation is what propelled me to help people in the same way.” 

Natural and Holistic Doctor

Over the 20 years that he’s has been in practice, Castaldi says, he’s never stopped learning new and better ways to achieve results for his clients with a wide range of health conditions. In addition to treating acute pain and inflammation, he reports having had great success helping people with autoimmune diseases, Lyme disease, gastrointestinal issues like IBS and constipation, allergies, asthma, headaches, anxiety and insomnia, among other chronic symptoms and conditions.

“As a natural and holistic doctor, I combine the power of Nutrition Response Testing, designed clinical nutrition, chiropractic adjustments and various applied kinesiology treatment procedures to restore my patients’ health and well-being,” he says. “The key is getting to the root of their health problems.”

Location: Holistic Health Care, 440 White Plains Rd., Ste. 200, Eastchester, NY. For more info, call 914.202.8633 or visit For a limited time, Natural Awakenings readers can receive an initial consultation for $125 (50 percent off).