Yes but you will look flabby. Many thin people look that way. Because of lack of muscle tone. You want a good balance of diet and exercise. Also muscle helps burn more calories. Cardio and light weights are all you need with a good diet and you will look and feel great
Yes, an average person who wants to maintain their weight should eat no more than 2000 calories a day. To lose weight long term and the most safely, 1500 calories a day. If you need it fast (I don't recommend this unless you work out a healthy diet plan first) 1200 calories a day.
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