[magnusson]

Fat-burning stops when you consume fat, not just when you consume carbs.

Effects of an oral and intravenous fat load on adipose tissue and forearm lipid metabolism. http://www.ncbi.nlm.nih.gov/pubmed/9950782

"Six subjects were fasted overnight and were then given 40 g of triacylglycerol either orally or as an intravenous infusion over 4 h. Intracellular lipolysis (hormone-sensitive lipase action; HSL) was suppressed after both oral and intravenous fat loads (P < 0.001). Insulin, a major regulator of HSL activity, showed little change after either oral or intravenous fat load, suggesting that suppression of HSL action occurred independently of insulin."