Key eligibility criteria are age @ years , BMI of @ ( @ for Asian Americans ) to @ kg/m ( @ ) , increased risk for diabetes ( defined as meeting two of three glycemic criteria for prediabetes established by the American Diabetes Association -LSB- fasting glucose @-@ mg/dL ( @-@ @ mmol/L ) , @-h postload glucose after @-g glucose load @-@ mg/dL ( @-@ @ mmol/L ) , hemoglobin Ac @-@ @ % ( @-@ mmol/mol ) -RSB- ) , and no hyperparathyroidism , nephrolithiasis , or hypercalcemia .