Quite similar to romaine lettuce, red leaf lettuce has leaves that are coloured red and are popular in salads as well as in other foods.
So can guinea pigs eat red leaf lettuce and if they can how much of it can be eaten?
Lets take a look at its nutritional data and find out a bit more about it.
In particular, its calcium, sugar, fat, phosphorus and acidic are most of interest as far as guinea pigs are concerned.
food info and image source wikipedia
As you can see red leaf lettuce contains a little phosphorus and calcium, and is a little acidic, it also contains a hint of fat and sugar,
With that in mind, guinea pigs can eat red leaf lettuce but only two to three times a week because of its acidic content.