It isn't the best way to say it. A better way is 'show me all your electrical bills from the past . Months, also I want to know how much you weigh right now and I want you to tell me again in three months'.

It will be just as offensive but carry more weight. Also if they blow up in your face just calmly reply with 'what? Is there something wrong? Maybe your health is declining and your job needs to be taken by a healthier person? Are you running a growing operation? Is that why your electric bill struck a nerve?'