I can offer some general information.
Weight changes can vary significantly from person to person based on various factors, including age, metabolism, physical activity level, body composition, and overall health. It's essential to remember that weight fluctuations are common and can be influenced by numerous factors, not just calorie intake.
If you are an 18-year-old and are experiencing weight gain when eating more than 900 calories per day, there could be several reasons for this:
Metabolism: Some individuals naturally have a higher or lower metabolic rate, which affects how their bodies process and burn calories.
Activity Level: If you are not engaging in regular physical activity, your body might be storing excess calories as fat, leading to weight gain.
Body Composition: Muscle weighs more than fat, so if you are gaining muscle through strength training or exercise, it can lead to an increase in weight despite losing fat.
Hormonal Changes: Hormones can play a role in weight regulation, and certain hormonal imbalances might contribute to weight changes.
Medical Conditions: Certain medical conditions or medications can influence weight.
Stress and Emotional Eating: Emotional eating, in response to stress or other emotional triggers, can lead to weight gain.
If you are concerned about your weight or experiencing unexplained weight changes, it is crucial to consult with a healthcare professional or a registered dietitian. They can help assess your individual situation, consider your medical history, lifestyle, and dietary habits, and provide personalized advice and guidance.
Remember, focusing solely on calorie intake may not be sufficient for understanding weight changes. A comprehensive approach that includes balanced nutrition, regular physical activity, and addressing any underlying health issues or emotional factors is essential for maintaining a healthy weight.