1 Vitamin B12 is found only in animal foods and fortified foods. 2  People who avoid all animal products should look for meat alternatives, such as soy products fortified with vitamin B 12. 3  Ten to thirty percent of older people may not absorb vitamin B 12 well.
Like brewed coffee, whole coffee beans add almost nothing to your caloric intake. As food energy is measured in calories, eating coffee beans will not technically provide you with energy. But coffee beans are high in caffeine, which can make you feel more energetic. Although there is no way to measure this subjective feeling, you need to eat approximately 4 to 6 tablespoons of coffee beans before you feel the energizing effects of caffeine.
What Drinking Coffee Actually Does To Your Body. 1  The caffeine enters your bloodstream and quickly finds its way to your brain, where it works as a stimulant and boosts alertness and energy. 2  The downside is that drinking too much can cause insomnia. 3  Thatâs partially because caffeine stays in your system for hours and hours. The way we metabolize coffee is called a half-life, Hunnes says. In most people, caffeine's half-life is 4 to 6 hours. It takes about 6 hours to reduce the amount of caffeine in our blood by about 50 percent, she explains.