Cory Booker responded to critics of his food stamp challenge on "Piers Morgan Tonight" Friday, saying he hoped his actions would inspire a more heated debate.

The Newark, N.J. mayor is more than halfway through a week living on the monetary equivalent of food stamps. He had $30 for the whole week -- a mere $4.32 a day -- to pay for all of his meals and beverages.

While he's been lauded on Twitter for his efforts to highlight the struggles of some 42 million Americans on food stamps, some have suggested he is misleading about how the program is designed to be used.

On Wednesday, CNN's Christine Romans took issue with Booker's challenge.

"It's not meant to be your only calorie intake source," Romans said. "'Supplemental' is the key. The government designs it so this is on top of what little money you might have, food pantries, soup kitchens."

Asked to respond to her comments, Booker said it was just "reality" that many Americans rely on food stamps to survive.

"There are many families -- and I talked to a group of security guard workers yesterday who make seven dollars and change, don't have health care benefits, so if they get sick, they have to either take days off of work and lose that money, or work through the sickness, who don't have retirement benefits, who find it hard at the end of the month to pay their rent, to buy their food, and are struggling," Booker said.

"She may think its a supplemental program, but for many Americans who are working even, this is the difference between going deep into food insecurity, not being able to provide for their families, and having a bridge to stability," Booker continued.

Booker is now on day five of his food stamp challenge. He has been tweeting, blogging and Instagramming his progress.

On Friday, he blogged that he had a terrible headache from lack of coffee and was rationing his food carefully so he wouldn't run out:

Today is the 4 day of my #SNAPChallenge and so far it has been the most difficult. I’m realizing more and more that my current daily food intake cannot continue at the same pace, and so my new focus is on smaller portions spread throughout the day.

This morning I had one apple for breakfast followed by a can of chick peas with seasoning and olive oil for lunch. My last meal of the day consisted of broccoli, cauliflower, black beans, corn casserole and a sweet potato which I ate in small portions between 2pm and 7pm this afternoon. I will likely not eat again until tomorrow morning in order to maintain enough food.

You can see Booker's groceries for the challenge here.

Also on HuffPost:

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  • Al Gore & Manbearpig

    This guy was super cereal about making a bad decision. <em>(<a href="http://ugliesttattoos.failblog.org/2011/02/09/funny-tattoos-manbearpig/" target="_hplink">Ugliest Tattoos</a>)</em>

  • Hillary Clinton

    This is what happens when you ask for a tattoo that nobody else in the world has. More on this <a href="http://www.philly.com/philly/blogs/entertainment/celebrities_gossip/Philly_tattoo_artist_gets_Hillary_tattoo_Hillary_camp_wont_discuss_it.html" target="_hplink">here</a>.

  • Bill Clinton

    Bubba's dreamy gaze really comes through on an inked up bicep. <em><a href="http://godfatherofgreenbay.xanga.com/photos/870ff281675986/" target="_hplink">(source)</a></em>

  • Tea Party

    'Merica.

  • Second Amendment

    You have to admire the directness of this tattoo. <em><a href="http://ugliesttattoos.failblog.org/2010/10/18/funny-tattoos-the-right-to-ugly-arms/" target="_hplink">(Ugliest Tattoos)</a></em>

  • Dick Cheney

    When in doubt, just cover up that old tat with one of an ex-vice president devil-goat. <em>(<a href="http://www.iphonesavior.com/2008/10/zune-tattoo-guy-makes-dick-cheney-the-devil.html" target="_hplink">source</a>)</em>

  • Don't Tread On Me

    The tattoo on the right must complicate the process of getting a back-walking massage. <em><a href="http://rsmccain.blogspot.com/2009/04/extreme-youth.html" target="_hplink">(source)</a></em>

  • GOP Elephant

    Well, would ya look at that. That's, uh, that's a tattoo. Go you. <a href="http://www.tattoorack.com/tattoo-designs/25634-gop" target="_hplink"><em>(Tattoo Rack)</em></a>

  • GOP Swastika

    Remember now, they're permanent. <em><a href="http://ugliesttattoos.failblog.org/2012/04/10/funny-tattoos-gopstika/" target="_hplink">(Ugliest Tattoos)</a></em>

  • JFK, Part I

    "Ich bin ein tattoo." <em><a href="http://lelkola.deviantart.com/journal/Tattoos-for-life-216746012#/d1xarbc" target="_hplink">(source)</a></em>

  • JFK, Part II

    We're sure it makes sense in the context of the rest of the arm. <em><a href="http://sinnermantattoo.com/yahoo_site_admin/assets/images/JFK.112133612_large.jpg" target="_hplink">(source)</a></em>

  • Anti-Gay Bible Scripture

    You know what else Leviticus says? <a href="http://bible.cc/leviticus/19-28.htm" target="_hplink">No tattoos</a>. Also <a href="http://bible.cc/leviticus/19-27.htm" target="_hplink">no haircuts</a>. <em><a href="http://www.youtube.com/watch?v=dF5M9v1ydh0" target="_hplink">(source)</a></em>

  • Richard Nixon

    And here's Nixon as a tattoo, by way of "The Simpsons." <em><a href="http://www.ratemyink.com/?action=ssp&pid=112075" target="_hplink">(Rate My Ink)</a></em>

  • President Barack Obama

    Whoa. Too much detail. <em>(<a href="http://offbeatink.com/experiences/can-we-get-an-obama-tattoo-yes-we-can/" target="_hplink">Offbeatink.com</a>)</em>

  • Obama 44

    Whoa. Not enough detail. <em>(<a href="http://www.tattoostattoo.com/Free/Obama-44-number.html" target="_hplink">source</a>)</em>

  • Sarah Palin

    We'd be remiss not to make an "I can see butt-crack from here" joke. More on the tattoo from the <em><a href="http://militarytimes.com/blogs/battle-rattle/2010/05/27/gunnys-sarah-palin-tattoo-the-butt-of-jokes/" target="_hplink">Military Times</a></em>.

  • Ronald Reagan

    Clearly a fan of trickle down economics. And tramp stamps. <em><a href="http://www.allweirdpics.com/pictures/Ronald_Reagan_Tattoo.htm" target="_hplink">(Allweirdpics.com)</a></em>

  • Ron Paul

    Reminds me of my Green Party tribal band. <a href="http://reason.com/blog/2008/03/20/the-revolution-will-be-tattoiz" target="_hplink"><em>(Reason)</em></a>

  • Sarah Palin, Part II

    <a href="http://en.wikipedia.org/wiki/List_of_Governors_of_Alaska" target="_hplink">Alaska's third-most popular half-term governor</a> assumes her rightful place on your calf, where she'll stay forever. <a href="http://ugliesttattoos.failblog.org/2011/07/15/funny-tattoos-unflippinbelievable/" target="_hplink"><em>(Ugliest Tattoos)</em></a>

  • Teddy Roosevelt

    An exact replica of the presidential portrait in the White House. That's what we hear. <a href="http://godfatherofgreenbay.xanga.com/photos/0dd12281676014/" target="_hplink"><em>(source)</em></a>

  • Sarah Palin, Part III

    Think of someone you find repulsive and toxic, then brand a picture of said person's face on your body. Voilà.

  • White Power Unicorn?

    This is one confused racist. <a href="http://ugliesttattoos.failblog.org/2012/02/08/funny-tattoos-nazi-rainbow-ponies-are-the-worst/" target="_hplink"><em>(Ugliest Tattoos)</em></a>

  • Jimmy Carter

    Poor Jimmy Carter -- always the *<em>butt</em>* of political jokes. See what we did there?