Many vegetarians, vegans and the elderly have a difficult time consuming their recommended daily allowance of vitamin B-12.

If you find your stomach making bizarre sounds and feel the need to sprint to the bathroom, it's possible that you ate something that didn't agree with you. Although fruits should be a staple of your diet because of their vast array of health benefits, some types of fruit can lead to diarrhea.

Being borderline diabetic, known as “prediabetic,” means that you’ll want to carefully start monitoring your sugar intake. Too much sugar can lead to weight gain, making it harder for you to manage your blood sugar level, which further increases your risk of developing Type 2 diabetes.

The gastrointestinal tract includes your mouth, stomach, small intestines and large intestines.

Iron is an essential trace mineral -- one that’s needed only in small amounts, but it plays a major role in how the body works and how you feel. Without adequate iron, the body can’t make red blood cells to carry oxygen, and you may feel more tired than usual, frequently dizzy or out of breath.

Whether you're looking for something to aid in your weight-loss efforts or trying to find a meal replacement for those days you're too busy to eat a decent meal, a protein shake may work. When you have diabetes, you need to find a protein shake that fits your diet plan and doesn't cause your blood sugar to spike.

Cheerios is one of the many popular breakfast cereals regularly consumed by many Americans, including diabetics. These breakfast cereals are low in fat, low in sugar and contain a type of fiber called soluble fiber, which has been shown to help lower LDL cholesterol levels.

Lunch meat refers to any type of sliced meat, usually sold at the deli counter in the grocery store or in the refrigerated meat case in presliced packages. Also known as cold cuts, lunch meat is inexpensive and an easy-to-prepare lunchbox meal.

Starting a new diet to lose weight, manage your blood sugar levels or reduce your risk of chronic disease might change your bowel patterns, especially in the first phases.

Any sudden change to your diet can have a negative impact on your digestive system. Switching to a low-carb diet, especially if you go very low carb in the initial stage, can lead to less frequency in your bowel movements. You may need to increase your intake of fibrous vegetables or look at your overall lifestyle.

Mucus is a thick, slippery substance secreted by glands and cells in your body. While mucus is naturally present in your body and helps protect your respiratory system, excessive mucus production can cause throat discomfort, nasal congestion and, in severe cases, breathing difficulty.

The muscular tongue functions in chewing, tasting and swallowing. Because of its nearly continuous use throughout the day, abnormalities become obvious very quickly, making the tongue a helpful marker of disease.