I am sorry I cannot tell you for sure what might be “consuming the leaves” on your Meyer lemon, but I bet it is a snail. Your choice of word makes it sound as if something is eating them up. Look at night with a flashlight for caterpillars, which rarely attack citrus. Or look for snails, the more likely culprit, which are first active after rain in March. This is most likely to be your problem and is easy to correct by hand picking and destroying the culprits. Then spread organic slug and snail control pellets. You will not see or find snails or slugs in the daytime. Or look for jagged edges on leaves which mean a ground squirrel, rat or rabbit has been chewing them. (Less likely.) Rats make straight clean cuts like a sharp pair of clippers or scissors. Most other animals leave jagged edges. Snails leave curved edges or holes and tracks of snail slime and caterpillars leave holes with smaller curves and black droppings beneath.

Make sure that no leaves touch the ground or surrounding walls or other plants, since these can be pathways to ants. Ants carry such pests as aphids onto host plants like citrus so that they can milk them for honeydew. The best organic way to control citrus pests when these trees are in pots as yours are is to cover the surface of the soil with an inch or two of earthworm castings. (Purchase these bags. Wormgold is a good brand if you can find it.) This will stop ants and other pests. Feed and water as usual.

If not “consumed” but, rather, disfigured, then it could be any number of things, such as aphids (solution: wash off and apply lady bug as explained in the Quick Tip on page 160 of my organic book. Other citrus pests include citrus mite, Asian citrus psyllid, various scales, thrips and other pests. None of these chew at leaves. Earthworm castings can help control all of these due to the fact they get rid of ants and contain chitinase, an enzyme that destroys chitin, which is the substance out of which the exoskeletons of insects are made.