We ate beets for dinner. I love beets--cooked and salted. Once, I forgot about a certain side-effect of eating beets and found myself worried for my health in the bathroom.

So let's get it straight.
First of all, I would like to make a reference to a cartoon of my childhood, Doug. Doug Funnie loved The Beets...

Doug also loved his alias fantasy, Quailman, and his dog, Porkchop...

...his faithful friend, Skeeter Valentine...

...and, of course, that babe, Patti Mayonnaise (said as his eyes turn to stars...)

Anyway, back to red pee...
Beeturia, the passing of red or pink urine after eating beets, plagues only 10-14% of people and can appear and disappear at different times in a person's life. Just because you have it tonight, doesn't mean you'll have it next year. It has to do with the oxalic acid in your intestines, which allows you to preserve the pigments from being degraded, those making more pigments available for absorption and secretion. More oxalic acid, more red pee. Beeturia is more common in people with iron deficiencies and depends on the type of beet as well as the method of cooking the beet.
Since we are talking about beeturia, we might as well also set straight the myths about asparagus pee. I also love asparagus. Grilled. With lemon juice. Mmmm...

This time, instead of a small portion of the population actually producing an altered form of urine, everyone's pee stinks after they eat asparagus. But, only around 20% of people have the gene to smell that rank smell. I'm lucky to not be of that small percentage.
So I can eat asparagus to my heart's desire.