n-3 fatty acid deficiency in man

Area of Science:

• Nutrition Science
• Biochemistry
• Clinical Medicine

Background:

• n-3 fatty acid deficiency can arise from long-term gastric tube feeding with inadequate intake.
• Clinical manifestations include dermatitis, scalp issues, growth retardation, and impaired wound healing.

Purpose of the Study:

• To describe clinical symptoms of n-3 fatty acid deficiency.
• To determine the necessary dietary intake of n-3 fatty acids for maintaining normal concentrations.
• To compare the efficacy of alpha-linolenic acid versus long-chain n-3 fatty acids.

Main Methods:

• Observation of nine patients with diagnosed n-3 fatty acid deficiency.
• Administration of various n-3 fatty acid supplements including cod liver oil, soya oil, alpha-linolenate, fish oil, and linseed oil.
• Monitoring of plasma and red cell lipid concentrations.

Main Results:

• Dietary alpha-linolenic acid supply of 1.0-1.2% is needed for mid-normal n-3 fatty acid levels.
• Minimal dietary requirement for n-3 fatty acids is estimated at 0.2-0.3% of total calories.
• Long-chain n-3 fatty acids are approximately twice as effective as alpha-linolenic acid in maintaining n-3 levels.

Conclusions:

• n-3 fatty acid deficiency presents with specific dermatological and growth-related symptoms.
• Adequate dietary intake of n-3 fatty acids is crucial for maintaining lipid concentrations.
• Long-chain n-3 fatty acids demonstrate higher efficacy than alpha-linolenic acid in this context.