Well we weigh more in the evening than in the morning. All the food you eat and drink all day are in your stomach. You can easily gain 5 or more pounds throughout the day. Don't weigh in the evening if it bothers you. Weigh in the morning, before eating or drinking anything and after going to the bathroom. Always weigh on the same scale, same time, same clothes for the most accurate gauge of weight loss. Google "why the scale lies" to understand why our weight fluctuates throughout the day.