Lipid content and essential fatty acid (EFA) composition of mature Congolese breast milk are influenced by mothers' nutritional status: Impact on infants' EFA supply

Abstract

Objective: To measure the lipid content and the fatty acid (FA) composition of breast milk as part of a nutritional survey of the essential fatty acid (EFA) status of 5 months old Congolese infants.

Design: Cross sectional nutrition survey.

Setting: A suburban district of Brazzaville (capital of the Congo).

Subjects: A random sample of nursing mothers and their 5 months old infants (n=102).

Data collection procedures: The mothers were questionned on their socio-economic status, dietary habits, and their body mass index (BMI) was measured. Breast milk samples were collected from each mother. Milk lipid content and fatty acid composition were determined.

Results: Compared with milk from various countries, Congolese women's mature breast milk was low in lipid (28.70±11.33 g/L) but rich in 8:0–14:0 FAs (25.97±8.17% of total FAs) and in polyunsaturated FAs (PUFAs), particularly n-3 PUFAs (2.39±0.68% of total FAs, mainly 18:3 and 22:6). This was associated with the frequent consumption of high-carbohydrate foods (processed cassava roots, wheat bread, doughnuts) known to enhance 8:0–14:0 FA biosynthesis, and with that of foods providing n-6 and n-3 EFAs such as freshwater and saltwater fish, vegetable oil, green leafy vegetables, and high-fat fruit (peanuts, avocado, bushbutter). These foods were traditionally and locally produced. Milk lipid content was negatively related with mothers' BMI (P<0.01) and varied with the frequency of consumption of certain foods corresponding to distinct dietary patterns.

Conclusions: Lipid content and FA composition of Congolese breast milk were dependent on mother's nutritional status. However, despite an adequate EFA composition of breast milk, partially breast-fed 5 months old Congolese infants probably did not get enough n-6 and n-3 EFAs from breast milk to meet their EFA requirements.

Sponsorship: Supported in part by the French Ministry of Research (contract no. 92.L.0728) and INRA (Institut National de la Recherche Agronomique).