Stress can have a negative impact on your overall health, and therefore, every effort needs to be made to adequately manage it. Although some people manage their stress levels with the help of prescription medications, stress can also frequently be managed through diet and exercise. The foods that you eat have a profound effect on stress levels. For example, eating a diet that is high in sugar and fat can contribute to anxiety, depression, insomnia, fatigue and headaches. In addition, consuming too much caffeine can significantly increase nervousness, cause palpitations and even contribute to a rise in blood pressure. Avoiding too much alcohol can also help reduce your levels of stress and anxiety.