In the present study the plasma lipid profile was elucidated in healthy, lean males by the use of lipidomic analysis in the hours after an acute intake of medium-chain fatty acids (MCT) and long chain fatty acids (LCT),, respectively. In addition oxygen uptake was measured to study energy turnover.

Four participants ingested MCT or LCT oil on two test days with one-week period between the experimental days. The day prior to the experimental days, the participants consumed a eucaloric control diet, and abstained from alcohol and vigorous physical activity to ensure similar conditions on experimental days.

On the test days, participants arrived by passive transport in the overnight fasted state (12 h) at 8 a.m., and a catheter was inserted into an antecubital vein. Following 30 min in supine rest, an overnight-fasted, basal venous blood sample was obtained. Subsequently, participants ingested the same test drink as in study 1 (containing 35g of MCT or LCT oil diluted in 100g of low-fat, low-carbohydrate cocoa milk) within five min. 100 ml water was provided together with the test drink. Venous blood samples were drawn every 30 min for the first two hours and every 60 minutes for the last two hours following intake. Participants rested in a bed throughout the test day. this This process was repeated on the second test day.

Inclusion Criteria:

healthy males BMI:20-27 recreationally physical active non-smoker no medicine

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Exclusion Criteria:

• high habitual intake of MCT-rich foods as coconut, coconut oil and dairy products