Hershey Buys Macadamia Nut Producer  SAN FRANCISCO (Reuters) - Hershey Foods Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=HSY.N target=/stocks/quickinfo/fullquote"&gt;HSY.N&lt;/A&gt; on  Monday said it would acquire Mauna Loa Macadamia Nut Corp. from  a private investor group for \$112.4 million, plus debt, as the  chocolate maker looks to add products that appeal to  health-conscious consumers.