Just as a small counter-argument to the obvious answer, remember that Jesus said the entire law was summed up as this:


  30 Love the Lord your God with all your heart and with all your soul and with all your mind and with all your strength.’ 31 The second is this: ‘Love your neighbor as yourself.’ There is no commandment greater than these.”


The question, of course, is whether being a true witness would cause injury. 

Oddly enough, if your wife is just looking to see that you love her, I would argue it is loving to "lie".  A better tack, however, might be to answer a different question - to say that indeed, to you, she looks beautiful.  And really, her words may be "Am I fat?" but she's really wanting to know, "Am I beautiful?"  Answer that question instead, and you'll be safe. 

If she were asking a medical question, a loving answer might be, "Dear, the doctor does want to you lose weight, and because I love you and want you to be with me for a long time, yes I think you need to do what the doctor says."

If she insists on asking the question out of vanity, however, then may I suggest the best answer is found in Job 40:14:


  Behold, I am of small account; what shall I answer you? I lay my hand on my mouth


How should a Christian respond to "Does this dress me look fat?"?
I pasted a drawing from PowerPoint to Word that has shapes with text. The drawing is much too large; but when I make it smaller, the text remains the same size and ruins the layout. Is there a way of reducing a shape along with the text it contains?
