The study is a crossover randomized controlled trials with 3 arms. Each arm has a duration of 3 weeks. 20 overweight/obese subjects will be enrolled into the study and randomized to the order of interventions. Before and after each intervention period, blood samples will be collected and the participants will have their resting metabolic rate measured. At the end of each intervention period, the participants will collect feces for 5 consecutive days. In addition, adipose tissue biopsies will be taken after each intervention period.