A nutritionist may work in all of the following facilities except:

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Nursing homes
Hospitals
Schools
Health food stores

Nursing homes

A nutritionist may work in nursing homes, hospitals, schools, but they typically don't work in health food stores.

To determine which facility a nutritionist may not work in, we need to consider the role and function of a nutritionist in different settings.

1. Nursing homes: Nutritionists can work in nursing homes to provide individualized meal plans and dietary recommendations for the elderly residents. They may assess nutritional needs, monitor food intake, and ensure proper nutrition for those with specific health conditions.

2. Hospitals: Nutritionists play a crucial role in hospitals, where they help patients manage and improve their health through diet. They work as part of a healthcare team to assess patients' nutritional needs, create specialized meal plans, and provide guidance on dietary restrictions or modifications based on medical conditions.

3. Schools: Nutritionists are often employed in schools to educate students, teachers, and parents about healthy eating habits and proper nutrition. They may develop school meal programs that align with nutritional guidelines, conduct workshops, and support students with specific dietary needs.

4. Health food stores: Although nutritionists may provide advice on healthy eating and dietary choices, they typically don't work directly in health food stores. Health food stores usually employ staff members with knowledge about nutritional products and supplements, but these individuals may not necessarily have the qualifications of a nutritionist.

Based on the roles and functions described above, the correct answer is that a nutritionist may not typically work in health food stores.