Reporting for doodie, Dr. Ellie Sattler plunges her hand into a pile of brontosaurus waste to find out what’s ailing the sick old beast in “Jurassic Park.” She could have spared herself the up-close and personal, if she had known how to read the colors of poop.

When your body’s food processor isn’t functioning correctly, those colors can tell you what’s going on in your insides.

Æ A medium-brown shade is the color of healthy poop.

Æ Pale, gray, clay-like poop suggests a liver problem. Bile from the liver is what makes stools brown; not enough and you get ashy shades indicating anything from gallstones to hepatitis, pancreatitis to cirrhosis.

Æ Black or dull-red poop sounds scary but is often related to food or meds. You may see black after eating black licorice, blueberries, iron pills or Pepto-Bismol. And red? That may come from beets and tomatoes.

Æ Green stools aren’t just for St. Patrick’s Day, although they can be from celebratory beer (it’s the green dye). Greenies can also come from eating lots of green vegetables, taking iron or certain medications.

Æ Bloody or maroon/red poop is most often caused by hemorrhoids, or it can be from intestinal bleeding; tarry black poop can be a sign of bleeding in the upper intestines or the stomach. So call your doc. Anything from ulcers to colon cancer could be brewing.

If you’re worried about any other colors you’re dropping, keep a three-to-seven-day record and share the shades with your doctor.

The You Docs — Mehmet Oz, host of “The Dr. Oz Show” and Mike Roizen of Cleveland Clinic — are authors of “YOU: Losing Weight.” To submit questions, go to www.RealAge.com. A King Features syndicate.