So can gerbils eat romaine lettuce?
Unfortunately they can’t as it is too full of water and will give them diarrhea if eaten. Water based foods are not good for gerbils as they cant process the water content like we can, and it basically goes straight through them. This is the case with many other vegetables such as broccoli.
Other lettuces such as iceberg and butterhead are also not good for them to eat.
If they nibble a bit of it, they will be fine but it isn’t a food that should be purposely be fed to them.
A food to avoid.