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I recently traveled between the US and Greece, and I wasn't going to let travel constipation ruin my dream vacation.

As a dietitian, I've learned that traveling can disrupt bowel-movement regularity for several reasons.

Changes in environment and routine can lead to stress, which can upset the digestive system. But when you travel, you're also often eating new kinds of food that may have different effects on your body.

Being in a different time zone can also interfere with your normal eating and bathroom schedules.

These factors, alone or combined, can lead to travel constipation -- a condition that's uncomfortable, at best.

Instead of leaving it up to chance, I try to stay ahead of digestive issues by bringing a few simple things with me. Here's what I packed when I went to Greece -- and what it did for me.