Aged at least 18 years with an ability and willingness to give written informed consent. 
Body mass index 25-35 kg/m2 
Users of at least 2 cups of caffeinated coffee per day who are willing to be randomized to any of the interventions. 
Non-smoking 

NCT00305097_inc_T1
Person
Aged
NCT00305097_inc_T2
Value
at least 18 years
NCT00305097_inc_T3
Observation
ability to give written informed consent
NCT00305097_inc_T4
Observation
willingness to give written informed consent
NCT00305097_inc_T5
Measurement
Body mass index
NCT00305097_inc_T6
Value
25-35 kg/m2
NCT00305097_inc_T7
Multiplier
at least 2 cups per day
NCT00305097_inc_T8
Drug
caffeinated coffee
NCT00305097_inc_T9
Observation
willing to be randomized
NCT00305097_inc_T10
Condition
Non-smoking