Since so many people are heavier are they going to start changing the recommended doses of drugs?

Weight and dose: Effective medication dose and patient weight do not necessarily correlate. There is an effective dose range for medications and in general we start with a low dose and move up based on efficacy and tolerability. Heavy patients sometimes only need low doses and vice versa. Starting at a high dose can cause a person to have side effects and problems that would not have happened at low dose.