It ‘may’ in some people be improved through diet and exercise, but it cannot be improved by government decree or laws, unless those laws are so restrictive they ruin peoples lives in other ways (such as by taking their freedoms and rights away).
Government has failed at everything it has claimed it was going to do to “improve peoples lives”.
Further, they do not ‘care’, to improve anyones lives except their own, through establishing an absolute dictatorship.
Stalin is their hero.