A study into the effects of 12 weeks of coffee drinking on non-coffee drinkers

INTERVENTION: Arm 1 (coffee intervention): four cups of coffee per day (made from 2 g instant coffee granules) for 12 weeks. Arm 2 (control group): no caffeine and four cups of water per day for 12 weeks. There will be no follow‐up for either arm after the 12‐week intervention and the final (second) study visit has taken place. CONDITION: Glucose metabolism ; Nutritional, Metabolic, Endocrine ; Glucose metabolism PRIMARY OUTCOME: 1. 2‐hour liquid meal tolerance test (glucose, insulin and triglycerides); 2. Fasting glucose; 3. Insulin; 4. Adiponectin; 5. Inflammatory markers ; 6. Lipids; ; Measured at baseline and after 12‐week intervention. SECONDARY OUTCOME: No secondary outcome measures INCLUSION CRITERIA: 1. Healthy adult males and females (aged 18+) 2. Weight stable for 3 months 3. People who do not drink tea and coffee regularly