Overweight and obese ( BMI 25 kg m ( -2 ) ) middle-aged and older adults ( aged 45-76 years at enrollment ) with type 2 diabetes ( n = 964 ) at four clinics in Look AHEAD , a trial evaluating an intensive lifestyle intervention ( ILI ) designed to achieve weight loss through caloric restriction and increased physical activity compared to diabetes support and education ( DSE ) , underwent standardized assessments of performance-based physical function including an expanded short physical performance battery ( SPPBexp ) , 20-m and 400-m walk , and grip and knee extensor strength 8 years post-randomization , during the trial 's weight maintenance phase .