Business law!

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4. Louisa, worried about her cousin Garth's dangerous obesity and seeming addietion to Power Up! promises to pay Garth, $10,000 if Garth stops drinking Power Upl and loses 100 pounds within the next two years. Garth agrees, performs his part of the bargain, and asks for the money. Louisa refuses to pay, saying that she forgot about the deal, but that even if she did make such a pledge, there was no valid consideration for it. Garth files a suit against Louisa. In whose favor is the court likely to rule, and why