You could go half-way and leak a very biased sample of data. Some people are terrified that there might come a day where our health insurers monitor the junk f

You could go half-way and leak a very biased sample of data. Some people are terrified that there might come a day where our health insurers monitor the junk food we buy via our credit card purchases. But why not just buy junk food with cash and healthy food with a credit card.