It doesn't seem fair, but some people make all the wrong choices and never face diabetes -- while others who are careful about everything they eat and drink end up in a fight for their lives with the disease.

That's because diabetes isn't always caused by what you put into your stomach. In some cases, it could be caused by what's already there -- like the 3.3 pounds of bacteria sitting in your intestine right now.

The balance of bacteria in the stomach can have far-reaching effects throughout the body -- from the obvious stuff, like digestion, to less obvious conditions such as your mental health and diabetes.

It's that last one we're interested in today, because a new study out of China finds that diabetics are far more likely to have an excess of bad bacteria in the stomach than people who don't have the disease.

It doesn't prove the bugs cause diabetes -- but it does show a link. To see if it's more than just a link, the researchers plan to give gut bugs from diabetic humans to healthy mice next, and you can bet I'll keep you posted on that one.

In the meantime, it's important to remember how even small changes to your gut can affect your overall health. Poor diet, an untreated infection, or even a single course of antibiotics can tip your own balance of bacteria in the exact wrong direction.

The problem is, most people have no way of knowing when their own balance is leaning the wrong way -- and that's why it's critical to be proactive about gut health.

And that means you need to take a probiotic supplement every day.

Avoid anything in the supermarket, where "probiotic" has become a marketing buzzword, and get yours from a health food store or vitamin shop -- and make sure you stick to a strain that's been tested and proven in human beings.

I wrote extensively about probiotics earlier this year in my printed newsletter, Health Revelations. It's too late for me to mail that issue to you -- but if you sign up for a subscription now, you can read that and all my other back issues in my online archives.