Quick Answer. The effects of caffeine start within 10 minutes after it is consumed, according to ScienceDaily. However, caffeine requires 45 minutes to reach its maximum concentration in the blood. Continue Reading.
The heart, blood, and blood vessels are the three structural elements that ... These nutrients enter the bloodstream by passing through the walls of the intestine.he heart, blood, and blood vessels are the three structural elements that ... These nutrients enter the bloodstream by passing through the walls of the intestine.
Sugar from these foods may hit the blood stream as fast as 15-30 minutes. Nutrients from foods that are high in fat or protein (such as a cheeseburger) will take longer to enter the bloodstream because fat may linger in the stomach for 2-4 hours and takes longer to digest.ugar from these foods may hit the blood stream as fast as 15-30 minutes. Nutrients from foods that are high in fat or protein (such as a cheeseburger) will take longer to enter the bloodstream because fat may linger in the stomach for 2-4 hours and takes longer to digest.