70 lbs. loss in 10 months is very good. Congratulations.

The real test is maintaining a diet over the long haul that allows you to keep it off. If a weird, unsustainable diet was involved in shedding weight it may be impossible to keep it off. My nephew lost a 100 lbs but it involved some kind of diet of a propitiatory shake and he alas gained it all back when he returned to the eating habits that made him overweight in the first place.