* The three official red meats are pork, lamb and beef. Pork is the leanest, lamb the fattiest and beef the most nutritious.
* Beef has 2.7mg of iron per 100g, and 4.1mg of zinc. A large proportion of the population, particularly teenage girls and women, are deficient in both minerals.
* Pork and lamb also contain zinc and iron, but not in the same quantities.
* Red meat is high in saturated fats and "bad" cholesterol, which can lead to clogged arteries and heart disease.
* But lean beef is actually fairly healthy; it will provide you with essential vitamins and minerals, but it will not have a high fat content.
* The British Dietetic Association says that up to 90g of lean red meat a day (equivalent to a portion of bolognese) is acceptable.
* But the Food Standards Agency (FSA) points out that different cuts of meat will have very different nutritional contents.
A lean pork leg joint will contain around 5.5g of fat per 100g, of which 1.9g will be saturated fat; compare that with a grilled joint of pork belly, which has 23.4g of fat, of which 8.2g will be saturated.
* A lean rump steak, grilled, has 5.9g of fat per 100g, of which 2.5g is saturated.
But the same cut of beef, not trimmed of its fat, and fried instead of grilled has 12.7g of fat, of which 4.9g is saturated.
The fat content of mince will vary widely, so the advice is always to look at the label and go for the leanest versions.