<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  How many calories do I need in a day? Context: The number of calories you need in a day varies based on age, gender, weight, height, and activity level, but on average, an adult requires around 2000-2500 calories per day. Answer: [/INST]The number of calories you need in a day depends on various factors like age, gender, weight, height, and activity level. However, roughly, the average adult needs about 2000-2500 calories per day.</s>