If you clicked on this page, it is likely that you are a physician, nurse practitioner, physician assistant, registered dietitian nutritionist, health psychologist or personal fitness trainer who wants to learn more about how to help your clients better manage their weight. 

And you may also be looking for a healthy weight loss program to recommend to your clients.  My latest book, Six Factors to Fit: Weight Loss that Works for You!, is a simplified, client-centered approach to weight management.


The uniqueness of my program is that it uses a 10-minute, scientifically-validated quiz to identify each person’s weight management challenges and offers evidence-based, personalized strategies for overcoming them.

It is a comprehensive approach that includes professional and step-by-step, structural guidance on diet, physical activity, behavior change, and mindset.

“What a privilege you will have to work with one of, if not the best expert in the field! That’s what you’ll get when you follow the Six Factors to Fit program and allow Dr. Kushner and his team to guide YOU toward a weight management plan that fits your life.”

Michael F Roizen MD

4 time #1 NY Times Bestseller and co-author of the RealAge, and YOU series and What To Eat When

“One thing is clear: every person's weight struggle is different. Six Factors to Fit is Dr. Kushner's expert approach to helping you identify and overcome YOUR struggle. It’s an engaging read filled with mindset and behavioral strategies for success. Buy this book! You will not regret it!”

Donna Ryan, MD

President of the World Obesity Federation

“If you are serious about losing weight and keeping it off, you need to read this book! Dr. Kushner is one of the most respected experts in the field and has used the latest research to create a program that gives you the best chance of long-term success.”

James O. Hill, Ph.D

Professor and Chair, Department of Nutrition Sciences; Director, Nutrition Obesity Research Center, University of Alabama at Birmingham; Author of “The Step Diet” and “State of Slim”

"Six Factors to Fit is scientifically evidence-based, practical, and caring. Dynamic team – doc, nurse, dietitian – hit the savory spot out of the park on this one. What these passionate professionals have that has been notably lacking in the field is extraordinarily effective communication skills and strategies, offering personalized tailoring that is the culmination of Dr. Kushner’s clinical insights and published research on the SIX FACTORS."

Christopher Gardner, PhD

Director of Nutrition Studies at Stanford Prevention Research Center

“Don’t get discouraged if you’ve tried everything to lose weight. In Six Factors to Fit, Dr. Kushner will quickly redirect you onto your path for success by helping you identify and overcome the issues that have been holding you back. It’s time to go beyond that one-diet-fits-all approach to take control of your weight and health – once and for all!”

Louis Aronne, MD

Director, Comprehensive Weight Control Center, Weill Cornell Medicine

"At last! A scientifically validated tool and a personalized weight loss program, based on each person’s behaviors, that I can recommend to patients and easily implement in my practice. Being able to validate therapeutic interventions as people lose weight is an added plus.”

Jeffrey I. Mechanick, MD

Medical Director, Kravis Center for Clinical Cardiovascular Health at Mount Sinai Heart​

“Losing weight and keeping it off can be a tough, lifelong struggle for many. But not anymore! With Dr. Kushner’s evidence-based guidance, you can improve your lifestyle, get healthier and break through your own barriers to achieve lasting success. I am certainly going to use these 6 factors in my busy practice as a part of the Six Factors to Fit self-help program.”

Carolyn Apovian, MD

Director of the Center of Nutrition and Weight Management at Boston Medical Center

“I love this book Six Factors to Fit! It’s packed with practical tips, meal and snack ideas and patient stories you can relate to, helping you learn that achieving a healthy weight is about tweaking your lifestyle to match your needs and fit your daily routine. A quick quiz, not a quick-fix diet, is the secret ingredient to getting you started on the right path.”

Connie Diekman, M.Ed, RD, CSSD, FAND

Former President of the Academy of Nutrition and Dietetics, Immediate Past Chair, Weight Management Dietetic Practice Group

“A remarkably friendly, flexible, and well-founded guide to weight management that provides practical strategies to address the many challenges of weight control which, for many individuals, include improving sleep, stress, self-talk, and self-image. Six Factors to Fit covers these and many other topics in an engaging and empathetic manner.”

Thomas A. Wadden, PhD

Professor of Psychology, Center for Weight and Eating Disorders, Perelman School of Medicine at the University of Pennsylvania

“Many women struggle with weight during perimenopause and feel that it is hopeless to even try to lose the unexpected and unwelcome extra pounds. With Six Factors to Fit, women can finally get inspiration, information and individualized, empathetic guidance from a leading expert to manage their weight while also lowering their risks of heart disease, breast cancer and uterine cancer.”

Lauren Streicher, MD

Women’s Health Expert; Author, Sex Rx: Hormones, Health and Your Best Sex Ever

“As a highly-regarded thought leader and model for science-based and compassionate weight management counseling, Dr. Kushner takes readers on a life-changing journey away from the typical one-size-fits-all, restrictive diet regimens, and toward positive and productive guidance, valuable for anyone working toward building a healthier life.”

Scott Kahan, MD, MPH

Director, National Center for Weight and Wellness; Faculty, Johns Hopkins Bloomberg School of Public Health

“Six Factors to Fit is an innovative and fresh take on improving one's weight and health while taking into account each person’s health habits and life stressors. Using helpful visual aids and progressive meal planning tools, Six Factors to Fit offers individuals personalized and achievable solutions to losing weight and keeping it off – a welcome change from the all-too-common ‘just eat less and move more’ mantra.”

Joe Nadglowski

President and CEO, Obesity Action Coalition

“Written by an internationally recognized leader in the field, Six Factors to Fit presents a realistic and science-based road to identifying and overcoming personal barriers to long-term management of weight and health. One size does not fit all!”

Arya M Sharma, MD

Founder and Scientific Director, Obesity Canada

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