Hi Gonneke,
The answer is inside your question:  The student misread her reference.  It is not true that 80% of the 'contents' of milk is macrophages.  80% of the cells in human milk are macrophages.  Language is a tricky thing :)
Marcia McCoy
 
>Date:    Tue, 25 Mar 2008 12:10:57 -0700
>From:    gonneke van veldhuizen <[log in to unmask]>
>Subject: macrophages in human milk

 > Dear friends,
 > I am in desperate need for your help and wisdom.  I mentor  a last year&#65533;s midwife 
>student for her thesis about relactation. She&#65533;s doing great, but somewhere she mentioned 
>that human milk is 80% macrophages. I asked her to re-do her research on this, because 
>there&#65533;s a lot more in human milk than macrophages. Then she came up with her reference:
 > <ProMom&#65533;s  101 reasons to breastfeed; reason #10
 > Breast milk contains immunities to diseases and aids in the development of baby's 
>immune system.
> Formula provides neither of these benefits. "Breastfed babies have fewer illnesses 
>because human milk transfers to the infant a mother's antibodies to disease. About 80% of 
>the cells in breast milk are macrophages, cells that kill bacteria, fungi, and viruses. 
>Breastfed babies are protected in varying degrees from a number of illnesses including, 
>pneumonia, botulism, bronchitis, staphylococcal infections, influenza, ear infections, 
>and German measles. Furthermore, mothers produce antibodies to what ever disease is 
>present in their environment, making their milk custom-designed to fight diseases their 
>babies are exposed to as well."
>Williams RD, "Breast-Feeding Best Bet for Babies", 



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