Comparison of the effects of supplemental red palm oil and sunflower oil on maternal vitamin A status
Lietz G1, Henry CJ, Mulokozi G, Mugyabuso JK, Ballart A, Ndossi GD, Lorri W, Tomkins A.
http://ajcn.nutrition.org/content/74/4/501.long
In summary, the results of the present study agree with earlier findings showing that red palm oil can increase maternal α- and β-carotene concentrations in both plasma and breast milk. More importantly, it seems possible to maintain breast-milk retinol concentrations for ≥3 mo after delivery through dietary supplementation with red palm oil. Both increases in milk β-carotene and maintenance of milk retinol concentrations are likely to be of considerable benefit to growing children.

Dietary intakes and plasma concentrations of carotenoids and tocopherols in relation to glucose metabolism in subjects at high risk of type 2 diabetes: the Botnia Dietary Study
Katriina Ylönen, Georg Alfthan, Leif Groop, Carola Saloranta, Antti Aro, Suvi M Virtanen, and the Botnia Research Group
June 2003
http://ajcn.nutrition.org/content/77/6/1434.abstract
The data suggest an advantageous association of carotenoids, which are markers of fruit and vegetable intake, with glucose metabolism in men at high risk of type 2 diabetes.