You're exercising. Carefully watching what you eat. Yet the scale has made a sudden jump upward, and your pants are a bit tight. How can this be? One thing you can check is your gut — digestive issues could be the cause. Some people have a bowel action every few hours, others just once a day. Whatever's your normal pattern, if it's not happening anymore, a backed-up system may be the reason behind those suddenly tight jeans [source: Cohen].
Irregularity may be due to a variety of factors. You may be dehydrated, not taking in enough fiber or lack the proper amount of good flora in your stomach. The easiest way to stay hydrated is to drink more fluids, but fruits contain a fair amount of water, as do (surprisingly) some meats like hamburger and chicken breasts [source: Davis].
Load up on fiber by noshing on such foods as beans, bran and fruit. You also may want to take probiotics, which are live bacteria and yeasts that are helpful to your digestive system. Probiotics come in pill form and are also added to various types of foods [source: DiLonardo].