The FDA isn't underfunded or understaffed by any stretch of the imagination. Their funding is mis-allocated and not optimally applied to protect the public that pays the funding.
Are you sure? A quick review of the budget over time shows that the biggest outlays are on food and drugs, which seems correct? In fact the medical drug industry is what, $300B and food is around $1.2T? The FDA is around $8B or .5% of the industry. Seems lowish for proper oversite of 2 really important parts of our lives.