Methods. 16 NW and 17 OW men were reported to the laboratory on 4 separate occasions (placebo, Caf tablets, coffee and decaffeinated coffee) each separated by 2-7 days. Before the first meeting they refill caffeine, physical activity and medical questionnaires. The investigators recruited only men who were healthy non-smokers with no comorbidities and the daily caffeine consumption was under 400 mg. Before each meeting participants had to comply guidelines outlined included fasting for 8 hours, avoiding intense physical activity 14 hours and moderate exercise 2 hours before measurements. The meetings conducted in the morning when the first session included anthropometric measurements (weight, height and waist circumference) and body composition measurements using Bioelectrical Impedance Analysis (BIA) and a digital caliper. Each session began with a measuring resting blood pressure and heart rate (Polar telemetric systems), after that participants were given randomly placebo or Caf tablets or coffee or decaffeinated coffee, waiting half an hour and then measuring the RMR and respiratory exchange ratio (RER), for half an hour using indirect calorimetry (canopy system). Then again measured blood pressure and heart rate at rest.