How to end world hunger, the Head and Shoulders method

The other night I was soaking in the tub, my mind wandering as it tends to do in its idle state, when I noticed a bottle of shampoo perched on the side of the bath. According to the large, bold letters on the front, 40 zingy limes had been squeezed into this one bottle of shampoo. Now this got me thinking as my eyes scanned the bathroom noting the plethora of products boasting natural ingredients. What if we were to place a worldwide ban on the use of foodstuffs in non-edible products? Those 40 limes could be used to feed those people suffering famine. I'm sure my hair will remain soft and shiny even without a pungent lime odour. Now I'm not pretending to know all of the ins and outs of the cosmetics industry, nor am I an expert on world hunger, but surely 40 limes would do a lot more good on someone's plate than in one single bottle of shampoo on the side of my bath. So would a worldwide ban really make a difference? I would like to think that it would and I would be more than happy for my hair to be treated with something which hadn't taken a perfectly edible foodstuff off of someone's dinner plate.