What percentage of weight loss is successful?

The research I've read has the range of 40% to 70% loss of excess weight as the standard.  So I gather these are considered successes.  I know most of us would not be happy with a 70% loss much less a 40%, but if you consider the success rate for diets, that is a fantastic number.  For just dieting, the expected "success" is 10% of your body weight.  So for someone at 300 pounds to lose 30 pounds dieting , that would be considered a success.   Obesity and weight loss are hugely complex and not fully understood issues.  Any significant loss should be seen as a success even if it is not down to the number you desire.   And remember, your age, how long you''ve been obese, and your genetics will play a role in whether 100% loss of excess weight is realistic for you. Good luck, Sally