You have to read this carefully as it is not very clear.
http://www.ncbi.nlm.nih.gov/pubmed/1...ubmed_RVDocSum
"Therefore, the fish oils DHA and EPA and perilla oil depressed excretion of urinary Ca and inhibited osteoporosis due to restricted food intake."
Inhibition of osteoporosis due to restricted food intake by the fish oils DHA and EPA and perilla oil in the rat.
Sun L, Tamaki H, Ishimaru T, Teruya T, Ohta Y, Katsuyama N, Chinen I.
Laboratories of Applied Biochemistry, Faculty of Agriculture, University of the Ryukyus, Senbaru 1, Nishihara-cho, Okinawa 903-0213, Japan.