Adding fat-soluble vitamins A, D, E and K to Schwartz's brew didn't make sense, since beer is fat free.

FORBES: To Your Health?

Vitamin D is a fat soluble vitamin that is mainly produced by exposure of the skin to ultraviolet light.

CNN: How much vitamin D do I need?

Vitamin D is a fat-soluble vitamin that occurs naturally in a limited number of foods, so fortified foods including milk, margarines and breakfast cereals and dietary supplements are the major source for most Americans.

CNN: How much vitamin D should someone over 55 take?

We do need some fat -- it transports fat-soluble vitamins (A, D, E, and K), carries flavors and helps you feel satisfied after eating -- but look for monounsaturated and omega-3 types and avoid saturated and trans fats.

CNN: Get the biggest bang for your calorie with nutrient-dense food

They found that a type of fat or type of cholesterol called cholesteryl-alpha-D-glucopyranoside plays a key role in helping it to grow.

BBC: Clues to beating stomach cancer

It found every 10% rise in body mass index (BMI) - used as an indicator of body fat - led to a 4% drop of available vitamin D in the body.

BBC: Study finds obesity can 'lead to lack of vitamin D'

"More is not necessarily better...some vitamins and minerals can be toxic in high doses, " particularly the fat-soluble ones which the body stores like Vitamins A, D, E and K, explained Claire Williamson, Nutrition Scientist at the British Nutrition Foundation.

CNN: Vitamin cafes: Japan's latest health injection