Red blood cells are the most common component of the four that make up the blood in your body. A low red blood cell count most commonly indicates anemia. Symptoms include fatigue, feeling weak, pale skin, chest pain, dizziness and an increase in heart rate. However, if you don't have a condition causing your low count, you may simply lack iron in your diet. To increase your red blood cell count, you must therefore consume more iron-rich foods, as well as adopt a better diet overall.