If you think something you're eating is terrorizing your tummy, try this food-elimination test.

1. Eliminate the suspect -- be it dairy products, wheat items, or processed sugars -- for 3 days in a row.
2. Keep a diary of how you feel during those days. Here are important clues to note.

Diary of a Digestive
If your digestion habits changed, your tummy felt more comfortable, or your energy levels jumped, those are sure signs that you may have a food-triggered irritability. If adding the food back in makes you feel like you have a touch of the flu, that would be another really strong sign.

Help Yourself
RealAge has tools and tips to help you get to the bottom of digestive troubles.

• Could you have celiac disease? Answer the questions in this article to find out.
• Trouble with bloating? We've got quick tips to help you shrink your middle.
• Think it's IBS? This symptom checker will let you know.

Wondering if your bowel habits are normal? Read this article to find out what's regular and what's not.