We've had massive government spending for >20 years now. When looking for explanations for new conditions, look for what has changed, not what hasn't changed.
If you've been eating the same for the last 20 years and you've been gradually gaining weight over the last 20 years, then it's your diet.
If you've been eating the same for the last 20 years and you suddenly gain weight, it's likely not your diet, it's something else -- exercise, illness, et cetera.