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Food high in saturated fat can raise blood cholesterol levels - Edexcel - GCSE Biology - Question 2 - 2013 - Paper 1
Question 2
Food high in saturated fat can raise blood cholesterol levels. Complete the sentence by putting a cross (X) in the box next to your answer. The enzymes for fat dig... show full transcript
Worked Solution & Example Answer:Food high in saturated fat can raise blood cholesterol levels - Edexcel - GCSE Biology - Question 2 - 2013 - Paper 1
Step 1
Step 2
Calculate the percentage change in the levels of cholesterol in the blood between eating 2 g of plant stanol esters per day and 8 g of plant stanol esters each day.
Answer
To calculate the percentage change in cholesterol levels, we can use the formula:
ext{Percentage Change} = rac{ ext{Change in Value}}{ ext{Original Value}} imes 100Assuming the cholesterol level change associated with 2 g of plant stanol esters is X and with 8 g is Y, the change in cholesterol is (Y - X). Thus, the percentage change can be written as:
ext{Percentage Change} = rac{(Y - X)}{X} imes 100Step 3
Describe how the level of cholesterol in the blood changes as the mass of plant stanol esters eaten increases.
Answer
As the mass of plant stanol esters consumed increases, the level of cholesterol in the blood generally decreases. This is because plant stanol esters compete with dietary cholesterol for absorption in the intestine, thus lowering the overall absorption of cholesterol into the bloodstream. More plant stanols result in greater inhibition of cholesterol absorption, leading to lower blood cholesterol levels.