It'd be easy enough to recreate the food chart in a spreadsheet program, but the problem would be in converting it to wikimarkup. There are HTML-to-wikimarkup converters on the net, so one could theoretically export the spreadsheet to HTML, then convert it to wikimarkup via such a converter and post the output of that to the wiki. However, OpenOffice 3.1.0 (which I use) apparently can only convert spreadsheets into either PDF or XHTML formats, neither of which are very useful for our purposes (here would be a benefit of getting a wiki that allows full XHTML, assuming any exist). Barring the ability to convert to wikimarkup, it will be necessary to recreate the chart directly in wikimarkup which requires more work than simply converting a spreadsheet, but would be easy enough to edit and improve upon once done. An interim solution might be to upload the image to the wiki and post it on one of the pages.
In any case, there is a link to the image of the chart on the 'Getting Started' page in the 'Charts, Maps, etc. section', here:
http://havenandhearth.wikia.com/wiki/Getting_Started#Charts.2C_Maps.2C_etc.%20There's also the 'FEP Table' right above that, which is basically the FEP section of the food chart sans colors.