B181: Stimulation of Thermogenesis by Bio-Active Food Ingredients

Obesity

green tea, caffeine, tyrosine, energy expenditure, energy intake

The primary aim was to measure the effect of green tea extract, tyrosine and caffeine on energy expenditure, appetite ratings and spontaneous energy intake together with recording of side effects in healthy normal weight subjects.

Background: Long-term weight maintenance of a weight loss is often unsuccessful. Often a weight regain is observed in most studies that could indicate that most subjects are not able to change their eating habits. There is a need for simple and safe methods to prevent weight gain and re-gain i.e. by increasing thermogenesis and decrease spontaneous energy intake (EI). Studies have shown that nutritional and food-related non-nutritional factors influence the adjustment of EI and EE as the compounds can enhance the diet-induced thermogenesis (DIT) and suppress appetite. Method: The present study was designed as a 4-way crossover, randomised, placebo controlled, dou-ble-blind study. Each treatment was separated by \>3 d washout period. All treatments were administered as tablets containing either 500 mg green tea extract (whereof 125 mg cate-chins), 400 mg tyrosine, 50 mg anhydrous caffeine, or placebo. on each test day body weight and composition was assessed. All participants underwent a 4.5-h assessment of energy expenditure by indirect calorimetry in a ventilated hood. Energy intake recorded of an ad libitum pasta salad brunch served after the last hood measurement Subjects: Twelve healthy lean (20\<BMI\<25) weight stable non-smoking subjects between 18-40 years of age were tested 4 times each with a wash-out period of at least 3 days.

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