Kevin D. Hall, Ph.D. is a scientist at the National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health. He recently developed the NIH body weight planner, an evidence based tool to reach and sustain a healthy body weight.
The tool is now web based but the NIH is developing mobile apps. Dr. Hall’s introduction:
A lot of people want to change their lifestyle to lose weight and improve their overall health but really don’t know what it takes. The recently developed NIH Body Weight Planner can provide support. It’s the first tool to use personalized information to calculate the required eating and physical activity changes to help people reach and stay at their goal weight. The Planner uses technology based on years of scientific research to accurately model how your body adjusts to changes in your eating and physical activity habits. Its calculations reflect the discovery that the widely accepted paradigm that reducing 3,500 calories will shed one pound of weight does not account for slowing of metabolism as people change their eating patterns and physical activities. This old rule of thumb is still widespread, but substantially overestimates how much weight people will actually lose.
Try the Body Weight Planner by entering your weight, sex, age, height, and physical activities during work and leisure. Then enter a target date for reaching your goal weight. You can also add details like percent body fat and metabolic rate. The Planner will then calculate your personal calorie and physical activity targets to achieve your goal and maintain it over time.