Vitamin, mineral, and antioxidant deficiencies have been shown to suppress the immune system which could contribute to disorders such as arthritis, cancer, cardiovascular disease, and diabetes. Low levels of fatty acids have been linked to mood disorders, depression, and difficulty losing weight. It is possible to be deficient in some vitamins, minerals, and antioxidants and not even be aware of it. Many people lead healthy lifestyles, yet it is common to still have deficiencies. That is because each of us is metabolically and biochemically unique and the micronutrient requirements for one person may be quite different from another. Even if you eat a well-balanced diet, if you do not absorb vitamins, minerals, antioxidants or other essential micronutrients properly, you could have deficiencies. Certain chronic illnesses like arthritis, cancer, fatigue, multiple sclerosis, for example, can directly affect your micronutrient needs. As does aging, smoking, alcohol, sedentary habits, and physical exercise. Testing blood levels for your personal micronutrient needs takes the guess work out of knowing if you need supplements or if you have adequate levels of the nutrients your body needs to function optimally.