Fox & Friends’ Wellness Week series examined the science behind two popular health trends: red light therapy and hot-cold temperature contrast therapies. To find out whether these practices deliver real health benefits or hype, the team tested both treatments firsthand at New York City wellness facilities.
Red Light Therapy
At La Reserve Esthetics and Wellness, the team explored red light therapy using LED light devices marketed for inflammation, muscle recovery, weight loss, anti-aging and collagen production. A spa employee explained that the therapy works by allowing the body to absorb heat and warmth from red-light bulbs, providing space for recovery and cell production. Fox News senior medical analyst Dr. Marc Siegel noted that the devices use LED light “close to infrared light” but remain visible and safer than sunlight. According to Siegel, consistent use can “promote healing of the skin and more collagen,” though users might need three or four weeks of usage before noticing visible impact.
Hot and Cold Contrast Therapy
The team then tested hot and cold therapies, with Fox News personality Adam Klotz starting in a 190-degree Fahrenheit sauna for 15 to 20 minutes, then immediately plunging into an ice bath with water temperatures between 46 and 48 degrees. Klotz described the physical reaction as an “immediate stress response” requiring controlled breathing through the shock. He characterized the aftermath as “a rush” and “definitely a shot of life,” noting that it “clears your mind” and “really improves my mental mood.”
The team reminded viewers that while these trends show promise, especially for muscle recovery and inflammation, professional medical advice should always be the first step before diving into extreme temperature therapies.
This article is an AI-assisted summary. All facts and figures are drawn from the original report: https://nypost.com/2026/05/04/lifestyle/do-red-light-therapy-and-cold-plunges-really-work-a-doctor-reveals-the-truth/