Are you one of the estimated 65 million Americans with digestive problems or do you always feel tired or irritable? Maybe it's what you're eating.

A local nutritionist said you can heal almost anything by changing your diet -- not necessarily from pharmaceutical drugs.

Nutritionist Scott Ohlgren isn't surprised Americans suffer from digestive problems, bad skin and fatigue. In our fast paced world, many people eat a lot of highly refined, highly processed, unnatural food and that's overwhelming our bodies.

"When you are sick, you have an inner terrain that is not supporting your human health and what we eat is the biggest influence on this inner ocean of ours," said Ohlgren.

Ohlgren said his 28-day cleansing program can help people get their bodies back on track by getting rid of foods that are hard to digest.

"By simply changing what you are eating on a daily basis, the symptoms will start to repair themselves," he said.

According to his book, the five big culprits are dairy foods, refined flour, sugar, bad oils (such as transfats or hydrogenated oils) and fake foods such as unnatural sweeteners like aspartame, food colorings. Caffeine should also be avoided, he said.

"You can do it once in a while because the body's capable of handling it, but day in and day out is what's killing us," said Ohlgren.

The food program may be a dramatic change for most of us but it's very simple. Just replace the trouble foods with lots of fruits and vegetables, real whole grains and little meat.

"The beginning of the cleanse, you can feel kind of lousy because your body is starting to repair itself," he said.

Dr. Kristin Van Konyneburg did the cleanse, hoping to get rid of bad acne. And after the diet, she has clear skin for the first time in 20 years.

As a family practice doctor, she has seen many people with fatigue or digestive problems feel better this way.

"I'm like, 'OK, one of the first things we do is look at your diet,' and it can really surprise people," said Van Konyneburg.

Adventure athlete Michelle Lyman thought she ate healthy until she changed her diet. Since then she has dramatically improved her race times.

"My doctor was amazed. I lost 17 pounds in three weeks and never put it back on. I have healthier skin, lower blood pressure, lower cholesterol," said Lyman.

And she has no more headaches -- something that she feared she'd always have.

Ohlgren has been eating this way for 30 years and swears you can eat this kind of food and enjoy it.

"Your health is in your control," he said.

He said you may not have to change how you eat forever but doing a cleanse once a year can help refresh the body. And even if you feel "fine" right now, you may discover there are some foods that you really do better and feel better without.