LSAT 103 – Section 3 – Question 15

LSAT 103 - Section 3 - Question 15

September 1998

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Question
QuickView		 Type Tags Answer
Choices		 Curve Question
Difficulty		 Psg/Game/S
Difficulty		 Explanation
PT103 S3 Q15
+LR
Most strongly supported +MSS
Causal Reasoning +CausR
A
2%
155
B
4%
160
C
91%
168
D
2%
159
E
1%
155
140
147
155
 +Medium 148.537 +SubsectionMedium

A person’s dietary consumption of cholesterol and fat is one of the most important factors determining the level of cholesterol in the person’s blood (serum cholesterol). Serum cholesterol levels rise proportionally to increased cholesterol and fat consumption until that consumption reaches a threshold, but once consumption of these substances exceeds that threshold, serum cholesterol levels rise only gradually, even with dramatic increases in consumption. The threshold is one fourth the consumption level of cholesterol and fat in today’s average North American diet.

Summary
A person’s consumption of cholesterol and fat is one of the most important factors affecting a person’s serum cholesterol level. Serum cholesterol levels increase proportionally to increased consumption of fat and cholesterol until a threshold is reached. Once this threshold is reached, consumption of fat and cholesterol only cause a person’s serum cholesterol level to rise gradually even if consumption of fat and cholesterol increases dramatically. The threshold is one fourth the consumption level of these substances in the average North American diet.

Strongly Supported Conclusions
A person who consumes a fraction of the amount of cholesterol and fat compared to the average North American may not have a significantly different level of serum cholesterol.

A
The threshold can be lowered by lowering the dietary consumption of cholesterol and fat.
This answer is unsupported. We don’t know what factors could cause the threshold to be lowered, if at all.
B
People who consume an average North American diet cannot increase their consumption of cholesterol and fat without dramatically increasing their serum cholesterol levels.
This answer is anti-supported. We know that once a threshold is reached, dramatic increases in the consumption of cholesterol and fat can only result in a gradual increase of serum cholesterol.
C
People who consume half as much cholesterol and fat as in the average North American diet will not necessarily have half the average serum cholesterol level.
This answer is strongly supported. If a person is consuming half as much cholesterol and fat than the average North American, then that person is still consuming double the the amount of these substances compared to the threshold.
D
Serum cholesterol levels cannot be affected by nondietary modifications in behavior, such as exercising more or smoking less.
This answer is unsupported. We only know that consumption of cholesterol and fat is one of the most important factors affecting serum cholesterol. It is possible that there are other factors that could affect serum cholesterol levels.
E
People who consume less cholesterol and fat than the threshold cannot reduce their serum cholesterol levels.
This answer is anti-supported. We know from the stimulus that, before a threshold, serum cholesterol levels are directly proportional to a person’s consumption of fat and cholesterol.

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