Mutton is meat from a mature sheep, and as such, can absolutely be included as part of a Paleo lifestyle. Like other red meats, mutton is an excellent source of protein, iron, niacin, zinc, and various B vitamins.
Paleo and Fat
Mutton is also a good source of saturated fat (even better than lamb). Despite what the media would have you believe, saturated fat is not detrimental to our health. In fact, it’s essential. Many of the vitamins found in meat (and elsewhere in our diet) are fat-soluble, meaning our bodies need fat in order to be able to use the nutrients.
Fat Makes You Lean
Another myth is that eating saturated fat makes us fat. This is also false. It actually has the opposite effect by promoting the breakdown of fat cells to be used for energy, unlike carbs, which promote the storage of nutrients as energy.
More Reasons to Eat Sheep
Eating sheep is such a good idea, that Mark Sisson labeled it a smart fuel.