Where is all that food going?

My kids used to be great eaters. They would eat anything I gave them. Even still their favorite things to eat are fish and veggies. (I wish I felt the same!) But lately they have had the appetites of birds one day and then they'll be ravenous the next day. There is no happy medium. Today is a ravenous day. Already today (by noon) they have had:

Oatmeal

Spinach Smoothies

Applesauce

Bananas

Plums

Cherrios

Steak

Chicken Dogs

Pickles

Jello

Pudding

Popcorn

Popsicles

She knows how to make a mess. She already had a bath after breakfast and I finally took her bib and shirt off during lunch. They were out of control. And she was wearing a white shirt...that's going to be fun. 

Somewhat cleaner now that he too is shirtless. He LOVES his popsicles. 

Seriously? They just keep wanting more. Chloe has been teething for the last 3 days. She has 4 molars coming in all at the same time. So the only thing I've been able to get her to eat since Sunday has been milk, smoothies, applesauce and oatmeal. Apparently she is feeling better today and making up for lost time. 

Are your kids the same? Do their appetites fluctuate all over the place too?