On a bright morning, Mr. Zhang, a retired teacher, sat in his garden with a book in hand. But he found that he couldn't concentrate at all, turning the pages of the book without reading a word. This is not because the books are boring, but because he feels an indescribable tiredness, as if even his soul is sleepy. This feeling has been bothering him for months: every day he feels low in energy, has no appetite, and is not interested in even his favorite activities. He began to wonder, what the hell was going on? 
This is not uncommon. Many middle-aged and elderly friends find themselves often in a state like Mr. Zhang, but they don't know the specific reason. Is it an alarm from the body, or is there something in the lifestyle that needs to be adjusted? Or is it a reflection of some deep psychological state? 1.Hidden physiological "culprits" Fatigue and lack of energy are not unprovoked, they can be a sign of some underlying problem in the body. When there is an abnormality in glucose metabolism in the body, the energy conversion efficiency decreases, resulting in general fatigue. In addition, increased blood pressure in the systemic arteries (i.e. hypertension) can also increase the burden on the heart and cause people to feel persistently tired. Thyroid dysfunction is also one of the common causes, which directly affects the body's metabolic rate, which affects the balance of energy production and expenditure. 2.Psychological factors: The mental burden that cannot be ignored in the fast-paced and high-stress environment of modern society makes psychological factors one of the main causes of fatigue and lack of energy. Long-term psychological stress, anxiety and depression not only consume a huge amount of mental energy, but also indirectly affect the health of the body through changes in hormone levels. Especially for middle-aged and elderly people, in the face of various changes and challenges in life, psychological pressure is often more difficult to alleviate, thus exacerbating physical and mental fatigue. 3.Lifestyle: The cumulative effect of daily habitsLifestyle choices have a direct and profound impact on health. Irregular work and rest habits, such as going to bed late and waking up late, lack of adequate rest and sleep, can seriously disrupt the body's biological clock, leading to long-term fatigue and lack of energy. At the same time, unbalanced eating habits, such as excessive intake of high-sugar and high-fat foods, not only increase the risk of abnormal glucose metabolism, but also lead to malnutrition, further exacerbating physical and mental exhaustion. In addition, a lack of moderate physical activity slows down metabolism and reduces the body's energy needs and efficiency, creating a vicious cycle. Fatigue and lack of energy are a "barometer" of physical and mental health, reflecting physical, psychological and lifestyle issues. In the face of these symptoms, we should not turn a blind eye, but should take active lifestyle adjustments, timely medical examinations and psychological counseling, find the real cause behind them, and take effective measures to solve them. With a comprehensive approach and appropriate life modifications, most people can significantly improve these symptoms and improve their quality of life. 
Regular work and rest: Balancing night and dayA good routine is the cornerstone of improving mental state. It is recommended to get 7 to 8 hours of sleep each night and try to go to bed and wake up at the same time** every day. Avoid using electronic devices at least an hour beforehand, as blue light can inhibit melatonin production and affect sleep quality. Eat a balanced diet: A diet that is a source of energy has a direct impact on physical health and mental state. A balanced intake of three meals a day is recommended, with a focus on foods rich in whole grains, vegetables, fruits, and high-quality protein. Reduce your intake of processed foods and foods high in sugar, which can cause fluctuations in blood sugar levels and affect mood and energy levels. Moderate exercise: The body restarts and regular physical activity can significantly improve mental state and physical health. It is recommended to do at least 150 minutes of moderate-intensity exercise per week, such as brisk walking, swimming or cycling. Exercise can not only improve sleep quality, but also promote blood circulation, improve cardiopulmonary function, and bring more vitality and good mood. Stress Management: Inner PeaceLearning to manage stress in everyday life is key to maintaining a good mental state. Simple relaxation techniques, such as deep breathing, meditation, or yoga, can be effective in reducing stress. Setting aside time each day for these activities can help reduce the mental burden and boost your mood. Seek professional help: Facing challenges togetherWhen self-management methods are not effective in solving problems, it is crucial to seek help from a medical or psychological professional. Whether it is a physical health problem or a psychological state of distress, timely professional advice and intervention can provide a more targeted solution. Self-monitoring and feedback: Keeping track of your sleep quality, eating habits, physical activity, and mood changes can help you identify lifestyle habits that are positively or negatively affecting your health. This self-monitoring can help with lifestyle adjustments to achieve better health and mental state. 
With the above practical countermeasures and suggestions, we can not only find the underlying causes of fatigue, lack of energy, and loss of appetite, but also take effective measures to improve these symptoms. Every small change in your life can have a big positive impact. Remember, a healthy lifestyle and a positive attitude towards life are key to maintaining mental vitality and good health.