Is it safe to lose 60 pounds in 4 months?

easy i just did this between may to sept 1st. No bread no pasta, no potatoes no rice, no starchy food no sweets. meet and vegetables and mediocre amount of fruit plus 1 to 2 hours working out a day 5-6 days of the week. including cardio. went 263 to 205 may 4th to sept 1st