I agree with the comments of others about focusing on the total intake of breastmilk, and the mother's eating a generally adequate and healthy diet, rather than just focusing on the fat content of her milk. 

However, there is this comment on www.mobimotherhood.org that might be of interest:
"Green Drinks
Green foods are reputed to increase the fat content of breastmilk. Some mothers supplement with chlorophyll. So-called "green drinks" can be very helpful. Their ingredients include barley-grass, alfalfa leaf, spirulina, corellas, kelp, oat-straw and other herbs with lactogenic and medicinal properties. 
Caution: Chlorella, a common ingredient in commercial green-drinks, is used by medical specialists to chelate (remove) heavy metals from the body, especially mercury. If not taken at the correct dosage, chlorella can lead to an increase of mercury in the bloodstream and probably in a mother’s milk as well. It is wise to choose green-drinks that only contain a low percent of chlorella." (http://www.mobimotherhood.org/MM/article-diet.aspx)

Fay Bosman, IBCLC
www.nwmothernurture.com, Vancouver, WA, USA

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