This causes a slight thickening of the blood which increases the workload on the heart. Dehydration may cause you to feel nausea, cramping or overall weakness. Unfortunately, the human thirst mechanism is a poor indicator of adequate hydration. Thirst is easily quenched before a body is sufficiently dehydrated after losing water. It is therefore important to pay attention to the amount of fluids consumed each day to ensure proper hydration.
Carbohydrates are the first fuel source used during exercise.
Cereals, pasta, fruits, vegetables, bread, potatoes, rice and sugars are all sources of carbohydrates. Carbohydrates are used for energy directly from the blood stream or stored as glycogen in muscle and liver tissue in small quantities for later use as energy. Adequate consumption of high carbohydrate foods results in optimal storage of glycogen in the muscle tissue and liver as well as an optimal blood glucose level. Consumption of these foods results in the rapid release of glucose into the blood stream and a rapid, increased release of insulin. Hypoglycemia leads to early fatigue and symptoms of exhaustion such as weakness, dizziness, and nausea.