<qa>  What will be included in prospective cohort studies?Study selection: The investigators will include either controlled dietary trials or prospective cohort studies. Randomized controlled trials that investigate the effect of including andor exchanging nuts for other nutrients on changes in body weight or markers of adiposity outcomes in humans will be included. Studies that are 3-weeks diet duration, lack a control, or assess intake during wasting conditionsmalnourished populations, pregnancy or lactation will be excluded. Prospective cohort studies will be included if they are 1-year duration and assess the relation of tree nuts andor peanuts with incident overweightobesity or changes in body weight or markers of adiposity. 