Upvote:-1
It means that we should avoid, or minimizing, eating milk that has continuously been boiled, because when it is being boiled for a long time, which it is when meat is being cooked in it, it becomes concentrated due to water evaporation.
Milk contains a relatively big percentage of saturated fat, which is unhealthy to drink/eat too much of. Skim milk, and small quantities of semi skimmed milk is a lot healthier than creamy full-fat milk, etc.
The Bible warns against eating animal fat.
Lev 7:23 (NIV) “Say to the Israelites: ‘Do not eat any of the fat of cattle, sheep or goats"
Upvote:1
One of several Jewish interpretations of this verse may be found here: http://thetorah.com/meat-and-milk-origins-in-the-text/
The one that appeals to me is that it was misinterpreted and originally meant that you should not wait until a young goat has been weaned before bringing it for sacrifice of first fruits.
Another idea with no evidential support is that it is forbidding a pagan practice common at that time.