hard · LSAT Logical Reasoning
Nutritionist: A diet is nutritionally adequate only if it supplies enough iron. Since the Kestrel diet plan supplies more than enough iron for an average adult, and since every nutritionally adequate diet plan on the market has been independently reviewed by a registered dietitian, the Kestrel diet plan must have been independently reviewed by a registered dietitian.
The nutritionist's reasoning is most vulnerable to criticism on the grounds that it
- treats iron sufficiency as though it guaranteed adequacy, rather than being merely required for it
- presumes that dietitians review only plans already known to be adequate
- never rules out that unreviewed plans might also supply enough iron for adults
- overlooks that a diet could be nutritionally adequate without ever being reviewed at all by any dietitian
- confuses independent review with sufficiency for adequacy, not necessity
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