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Ch. 24 Nutrition, Metabolism, and Energy Balance
Chapter 23, Problem 25

While attempting to sail solo from Los Angeles to Tahiti, Seth encountered a storm that marooned him on an uninhabited island. He was able, using his ingenuity and a pocket knife, to obtain plenty of fish to eat, and roots were plentiful. However, the island was barren of fruits and soon his gums began to bleed and he started to develop several infections. Analyze his problem.

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1
Identify the symptoms: bleeding gums and frequent infections.
Recognize these symptoms as indicative of a deficiency in a specific vitamin.
Recall that bleeding gums and susceptibility to infections are classic signs of scurvy.
Understand that scurvy is caused by a deficiency in Vitamin C (ascorbic acid).
Conclude that Seth's diet, lacking in fruits and vegetables, is missing Vitamin C, leading to his symptoms.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Nutritional Deficiency

Nutritional deficiency occurs when the body lacks essential nutrients required for proper functioning. In Seth's case, the absence of fruits indicates a lack of vitamins, particularly vitamin C, which is crucial for preventing scurvy. Symptoms like bleeding gums and infections suggest that his diet, while sufficient in calories from fish and roots, is inadequate in vital nutrients necessary for immune function and overall health.
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Survival Skills

Survival skills encompass the techniques and knowledge necessary to sustain oneself in the wild. Seth's ability to catch fish and identify edible roots demonstrates his resourcefulness. However, effective survival also includes understanding the nutritional value of food sources and the importance of a balanced diet, which he seems to lack on the island, leading to health complications.
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Isolation and Mental Health

Isolation can significantly impact mental health, leading to feelings of loneliness, anxiety, and depression. Seth's marooning on an uninhabited island not only poses physical challenges but also psychological ones. The stress of survival, combined with the lack of social interaction, can exacerbate his situation, making it crucial to address both his physical and mental well-being during this ordeal.
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