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Dietary essential fatty acid supply and visual acuity development
E E Birch1, D G Birch, D R Hoffman
1Retina Foundation of the Southwest, Dallas, TX 75231.
Insights
Dietary omega-3 fatty acids are crucial for visual development in premature infants. Supplementation with marine oil improved visual acuity in very low birth weight (VLBW) infants, reaching levels comparable to breastfed infants.
Area of Science:
- Neonatal nutrition
- Developmental neuroscience
- Ophthalmology
Background:
- Visual acuity development is critical for preterm infants.
- Omega-3 fatty acids are essential nutrients with potential roles in visual development.
Purpose of the Study:
- To evaluate the impact of dietary omega-3 fatty acid supply on visual acuity in very low birth weight (VLBW) infants.
- To compare visual development across different infant feeding formulas.
Main Methods:
- Randomized controlled trial involving VLBW infants (born 27-33 wk postconception).
- Three diet groups: corn oil (linoleic acid), soy oil (linoleic and alpha-linolenic acids), and soy/marine oil (added long-chain omega-3 fatty acids).
- Visual acuity assessed using visual-evoked potential (VEP) and forced-choice preferential-looking (FPL) at 36 and 57 wk postconception.
Main Results:
- VLBW infants receiving marine oil had higher erythrocyte omega-3 levels and superior VEP and FPL acuities compared to the corn oil group.
- The soy oil group showed intermediate omega-3 levels and poorer VEP acuity than the marine oil group at 57 wk.
- Only the marine oil group achieved visual acuities comparable to breastfed VLBW infants and full-term infants.
Conclusions:
- Dietary omega-3 fatty acid supply significantly influences visual acuity development in VLBW infants.
- Formulas enriched with long-chain omega-3 fatty acids, particularly from marine sources, support optimal visual development.
- These findings underscore the importance of omega-3s for visual maturation in high-risk infant populations.
Abstract:
The influence of dietary omega-3 fatty acid supply on visual acuity development was evaluated in very low birth weight (VLBW) infants using visual-evoked potential (VEP) and forced-choice preferential-looking (FPL) procedures at 36 and 57 wk postconception. The VLBW infants born at 27-33 wk postconception were randomized to one of three diet groups: corn oil, which provided solely linoleic acid; soy oil, which provided linoleic and alpha-linolenic acids; or soy/marine oil; which was similar to the soy oil formula but also provided preformed long chain omega-3 fatty acids. The VLBW infants in the soy/marine oil group had higher omega-3 levels in erythrocyte membranes and better VEP and FPL acuities at 36 and 57 wk than infants in the corn oil group. The soy oil group had intermediate omega-3 levels in erythrocyte membranes and significantly poorer VEP acuity at 57 wk compared with the soy/marine oil group. Only the soy/marine oil group had acuities comparable to the "gold standards" of VLBW infants fed human milk and preterm infants who were born and tested at 35-36 wk postconception. In addition, VEP and FPL acuity were poorer in a nonrandomized group of formula-fed full-term infants than in breast-fed full-term infants. The results suggest that dietary omega-3 fatty acid supply may play an important role in early human visual development.