Imagine eating 12 pounds of food a day -- and still staying thin and healthy. That may sound crazy, but it’s exactly what our hunter-gatherer ancestors ate for millennia! And they didn't have any obesity or chronic diseases like heart disease, diabetes, cancer, or dementia.

Of course, I wouldn't advise anyone today to eat 12 pounds of food, because the food in our society lacks one major secret ingredient that our ancestors ate in nearly all their food -- fiber!

Fiber has so many health benefits that I want to focus on it in this week's blog. I’ll explain some of its benefits and give you 9 tips you can begin using today to get more fiber in your diet. I’ll also tell you about my favorite “super-fiber” that can help you increase your total fiber intake overnight.

But before I tell you about what fiber can do for you, let's a look a little more at the history of fiber.

What vitamin do we need in amounts up to 25 times higher than the government recommends for us to be healthy?

What vitamin deficiency affects over half of the population, is almost never diagnosed, and has been linked to many cancers, high blood pressure, heart disease, diabetes, depression, fibromyalgia, chronic muscle pain, bone loss, and autoimmune diseases like multiple sclerosis?

What vitamin is almost totally absent from our food supply?

What vitamin is the hidden cause of so much suffering that is so easy to treat?

The answer to all of these questions is vitamin D.

Over the last 10 years of my practice, my focus has been to discover what the body needs to function optimally. And I have become more interested in the role of specific nutrients as the years have passed.

Two recent studies in the journal Pediatrics found that 70 percent of American kids aren't getting enough vitamin D, and this puts them at higher risk of obesity, diabetes, high blood pressure, and lower levels of good cholesterol. Low vitamin D levels also may increase a child's risk of developing heart disease later in life.

Overall, 7.6 million, or 9 percent, of U.S. children were vitamin-D deficient, and another 50.8 million, or 61 percent, had insufficient levels of this important vitamin in their blood.

Over the last 5 years, I have tested almost every patient in my practice for vitamin D deficiency, and I have been shocked by the results. What’s even more amazing is what happens when my patients' vitamin D status reaches optimal levels. Having witnessed these changes, there's no doubt in my mind: vitamin D is an incredible asset to your health.

That is why in today’s blog I want to explain the importance of this essential vitamin and give you 6 tips on how to get optimize your vitamin D levels.

Let’s start by looking at the massive impact vitamin D has on the health and function of every cell and gene in your body.

Imagine having a condition with symptoms so severe that you can't leave the house, yet your doctor calls it a "functional," or "psychosomatic," disease -- meaning that it's all in your head.

Frustrating? Absolutely.

But it's a very real problem for the 60 million people -- that's 20 percent of Americans -- who have irritable bowel syndrome (IBS). These people are plagued by uncomfortable and often disabling symptoms like bloating, cramps, diarrhea, constipation, and pain.

I have lots of patients with IBS, some of whom have suffered for decades without relief. Their previous doctors couldn't find the cause of the illness, so they were told to just get more fiber or take Metamucil, or were prescribed sedatives, anti-spasm drugs, or antidepressants.

That is NOT the answer. I've found a better way. And in today’s blog I am going to share 5 steps you can take right now to cure IBS without drugs.

But first I want to tell you about a patient of mine ...

"Live to 120 years old by eating as much as you want and drinking lots of red wine!"

That's the intriguing finding of a recent study from Harvard researcher David Sinclair and his group.

The only catch is that you'd have to drink about 1,500 bottles of wine a day to get those results. Of course, that would kill you pretty quickly -- before you'd have a chance to reach age 120! Still, those are important findings ...

In fact, Dr. Sinclair thinks they're so important that he started a company to produce a pharmaceutical derivative of the active compound in red wine, resveratrol.

Although his findings have merit, I think he is misguided in his attempt to find a "magic pill" that will allow you to eat whatever you want and live forever. The body is much more complex than that.

This week, I'm going to explain why a magic pill WON'T work -- and provide ten tips that really WILL help you live longer and prevent all the diseases of aging.

Confused about what "good nutrition" is?

You shouldn't be -– we know what works and what doesn't.

In a moment, I will share 5 simple tips to help you optimize your nutrition and achieve vibrant health, but first let me clear up a few misconceptions.

Despite the "conflicting" scientific studies and media reports designed to confound rather than enlighten, there is no confusion about what constitutes good nutrition.

If we were to gather the world's top nutrition scientists and experts —- free from food industry influence -- there would be very little debate about the essential properties of good nutrition.

Unfortunately, most doctors are nutritionally illiterate. Worse, they don’t know how to use the most powerful medicine available to them: food.

Common sense and scientific research both lead us to the conclusion that if we want healthy bodies, we must put the right raw materials into our bodies: real, whole, local, fresh, unadulterated, unprocessed, and chemical-, hormone-, and antibiotic-free food.

There is NO role in our diets for foreign molecules such as trans fats and high-fructose corn syrup, which interfere with our biology at every level.

If you want junk out, put junk in. Enough said.

If you want a whole, healthy body, put in whole real food.

Today I will explain how you can do that ...

This is the first in a 7-part series where I will give detailed explanations about each of the 7 Keys to UltraWellness. Key #1 is Optimize Nutrition, and in this blog I will explain what constitutes a healthy diet, give you some tips to help you optimize your nutrition, and clarify whether or not supplements are truly a waste of money.