Caffeine is also a physical stressor. It speeds you up for as long as 20 hours. Its effects are different in different people. For example, for some people it causes headaches, and for others, it relieves them. Caffeine can cause symptoms such as sleeplessness, upset stomach, increased blood pressure, and in women, breast lumps.
Withdrawal can include severe headaches, nervousness, grouchiness, and rapid heartbeat.
Many sugary foods contain little food value. Yet eating them leaves you less hungry for nutritious food. Then your body lacks important vitamins and minerals. Sugary foods such as desserts, candy and soda pop can contribute to weight control problems. When you gain weight and don't want to, you can feel depressed, anxious or unhappy, adding to your stress level.