Are you sure, Todd?  I know that grassfed beef contains ten times the  
beta carotene as grain fed.  Since the body can readily convert beta  
carotene to vitamin A, I'd think you'd be able to get more than  
sufficient amounts.  But I'd need to do the math.  Here's some info:

"Descalzo et.al., 2005, found pasture-fed steers incorporated  
significantly higher amounts of ß-carotene into muscle tissues as  
compared to grain-fed animals. Concentrations ranged from 0.63 – 0.45  
µg/g and 0.06 – 0.5 µg/g for meat from pasture and grain-fed cattle  
respectively, a 10 fold increase in ß-carotene levels for grass-fed  
beef. Similar data is reported by Simonne, et.al., 1996; Yang et.al.,  
2002a; and Wood and Enser, 1997, presumably due to the high ß- 
carotene content of fresh forage as compared to cereal grains  
(Simonne et al., 1996)."

Jim

On Aug 1, 2008, at 7:10 AM, Todd Moody wrote:

> That diet of 75% lean beef would be, unfortunately, devoid of  
> vitamin A, which is not present in muscle meats. To get pre-formed  
> vitamin A (an often overlooked nutrient, in my opinion) you must  
> eat organ meats or use fish liver oil.
>
> Todd Moody
>