Nutritional influences on linear growth: a general review

Area of Science:

• Nutritional science
• Pediatric growth and development
• Public health nutrition

Background:

• Linear growth faltering is a significant issue in developing countries.
• Specific nutrients including energy, protein, zinc, iron, copper, iodine, and vitamin A are crucial for growth.
• Existing research on nutrient supplementation for linear growth shows inconsistent results.

Purpose of the Study:

• To review the current understanding of specific nutrient roles in linear growth faltering.
• To identify reasons for conflicting evidence regarding nutrient supplementation and linear growth.
• To explore the early onset of growth stunting and potential contributing factors.

Main Methods:

• Literature review of studies on nutrient roles in linear growth.
• Analysis of data from the Nutrition Collaborative Research Support Program (CRSP) and other reports.
• Examination of intervention studies focusing on single nutrient supplementation.

Main Results:

• No consistent evidence found that single nutrient supplementation significantly benefits linear growth across studies.
• Interventions showed varied effects, impacting length gain, weight gain, or having no effect.
• Data suggests multiple, simultaneous nutrient deficiencies may limit growth in many populations.
• Most interventions were tested on children past the critical early period for linear growth faltering.

Conclusions:

• Single nutrient supplementation is not consistently effective for improving linear growth.
• Multiple nutrient deficiencies are a probable cause of growth faltering.
• Growth stunting likely begins very early in infancy, but more research is needed.
• Further investigation into early-life nutrition and combined deficiencies is warranted.