Is 90 pounds an average weight for someone who is 5ft tall?

Answer 1

No, that is extremely unhealthy and unsafe. Someone who is only 5 feet, or 60" tall, should weigh anywhere from about 115 (on the lower end) to 125 (on the higher end).

Always consult a doctor or dietitian before beginning any weight-loss program.

Answer 2

90 pounds in definitely considered "underweight," but it's not necessarily unhealthy as long as you are eating properly. Height is also a major consideration, as 90 pounds is much more normal for someone who is 4'11" than someone who is 6' tall.