B is wrong here because we know nothing who should and shouldn't adopt "low fat" diets specifically. The nutritionist doesn't discuss whether or not low-fat diets are ever a good or bad idea- maybe they're actually really good idea for everyone? The information we are given later on about insulin production and how our body deals with simple sugars isn't stated to be restricted to people on a certain diet.
D matches up perfectly with the line of reasoning in the stimulus. We know that two things can happen when we eat simple carbohydrates and our bodies overproduce insulin: energy is created when it is needed, or energy is stored as fat. Thus, it's not so far of a jump to say that, if you're eating way too many carbohydrates than what your body needs for energy at the present moment, you are going to store some of the excess as fat. So, according to (D), if you want to avoid gaining body fat, you should limit foods high in simple carbohydrates.
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B is wrong here because we know nothing who should and shouldn't adopt "low fat" diets specifically. The nutritionist doesn't discuss whether or not low-fat diets are ever a good or bad idea- maybe they're actually really good idea for everyone? The information we are given later on about insulin production and how our body deals with simple sugars isn't stated to be restricted to people on a certain diet.
D matches up perfectly with the line of reasoning in the stimulus. We know that two things can happen when we eat simple carbohydrates and our bodies overproduce insulin: energy is created when it is needed, or energy is stored as fat. Thus, it's not so far of a jump to say that, if you're eating way too many carbohydrates than what your body needs for energy at the present moment, you are going to store some of the excess as fat. So, according to (D), if you want to avoid gaining body fat, you should limit foods high in simple carbohydrates.