The Department of Agriculture could be trimmed down greatly. Much of the USDA functions as pork barrel spending does in a overly large bill. Under the USDA, there is many welfare programs: WIC, free lunches, subsidies for cities and colleges, food pyramid guidelines, and 4H programs. The function of meat/produce inspection can be one of the only arguable functions of the Department of Agriculture.
First of all, federal money is mishandled badly as George Washington said in his farewell address. People in Vermont can pay more in federal money than citizens in Utah; and Utah can end up with more federal cash. The government is very bad with handling funds. The corruption and greed always come into play.
Every hand-out program is tough to turn away from. Taxpayers are picking up the tab for people on WIC who didn't plan for a child. By giving welfare programs it allows citizens to act more foolishly in life because they know there is a safety net. They rely on that safety net and they won't want to ever leave the safety net. You have to remember the if you give a mouse a cookie principle.
Students can always bring their own lunch to school instead of receiving it for free. They're are many non-profit (non-government) institutions willing to help people out.
Colleges receiving money from the USDA will always rely on them for money. This also allows for higher administration pay. Professors and administration have rich salaries in part thanks to federal money. Colleges are capable of fund raising without having to accept federal USDA grants.
The food pyramid is a catastrophe. It changed in 2005 wasting more money. The government cannot even get your dietary health correct. People are more than capable in going to the library, internet, or asking parents/grand parents what is good/bad to eat.
4H is an honorable activity. The people associated with 4H are more than capable of raising funds for their own projects. Again someone paying federal taxes might not have an interest in 4H but ends of paying for their activities.
The inspection of food can be argued as needed, but it should be constitutional acceptable.
Thanks for reading my thoughts. I hope it sparks ideas and possibly changes your frame of mind.