Database Category Descriptors

Category	Study Types	Weight Gain, Loss or Maintenance	Description of Studies Included
Diet Types < 6 Months	RCTs	Loss	Macronutrient Ratios, Meal Timing or Fasting with Outcome Measures less than 6 Months after Start of Study
Diet Types > 6 Months	RCTs	Loss	Macronutrient Ratios, Meal Timing or Fasting with Outcome Measures greater than 6 Months after Start of Study
Mediators of Weight Loss	RCT & Obs	Loss	Individual Treatment Methods, Pysche, Clinician Techniques, and Factors that Lead to Weight Loss
Metabolism	RCTs	Loss or Gain	Calories/Oxygen Consumption, Short-Term Feeding, Metabolic Studies
Correlates of Weight Gain	Obs	Gain	Observational & Prospective Relationships of Diet and Behaviors to Weight Gain over Time
Individual Nutrients	RCTs & Obs	Loss or Gain	The Effect of Individual Nutrients rather than Dietary Patterns on Weight Loss or Gain
Diet Types < 1 Month	RCTs	Loss	Macronutrient Ratios, Meal Timing or Fasting with Outcome Measures less than 1 Month after Start of Study
Physical Activity	RCTs & Obs	Loss	The Effect of Physical Activity and/or Exercise on Weight Loss
Weight Maintenance	RCTs & Obs	Maintenance	Dietary and Behavioral Factors Leading to Weight Loss Maintenance
Trends Prevalence Methods	Obs	Documentation	Documentation of Dietary Trends, Prevalences of Obesity Related Factors, and Research Methods
Category	Study Types	Weight Gain, Loss or Maintenance	Description of Studies Included

Obs – Observational Studies
RCTs – Randomized Controlled Trials