(FILES) A file photo taken on January 20, 2012 shows tomatoes displayed at the Australian booth of the so-called Green Week (Gruene Woche) Agriculture and food Fair in Berlin. An international scientific team on May 30 said it had unravelled the genetic code of the tomato, opening up ways to improve the fruit's taste, nutrition and shelf-life. Gathering more than 300 researchers in 14 countries, the Tomato Genome Consortium compared today's domesticated tomato with its wild South American parent, Solanum pimpinellifolium. The tomato has 35,000 genes, but there is only a variation of 0.6 percent between the wild variety and the supermarket variety of today, according to the study, appearing in the journal Nature. AFP PHOTO / ODD ANDERSEN
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番茄（圖）含大量強效抗氧化劑茄紅素，能修補氣管受損細胞，加快哮喘童復元
虽然营养师指有机与非有机食品营养价值相差无几，但有些蔬果最好还是选吃有机的，例如所谓蔬果12脏（dirty dozen），据eatingwell网站指，12脏包括桃子、苹果、甜钟椒（sweet bell pepper）、芹菜、蜜桃（nectarine）、草莓、樱桃、小番茄（cherry tomato）、进口葡萄（特别是从智利进口的葡萄）、菠菜、黄瓜和番茄，因为生长过程中，非有机菜果农都大量施用杀虫剂。
值得注意的是，无论是加拿大还是美国，organic并不必须是百分之百有机，这也是北美媒体经常警告的“Organic doesn’t mean 100% organic”。
美国有机食品标准由美国农业部（United States Department of Agriculture，USDA）颁布，比加拿大早，规定也更为完善。美国有机食品标签主要分为4级，包括“100% Organic”即完全有机食品，主要用于蔬菜和水果；“Organic”即有机含量达95%以上；“Made with organic ingredients”指有机含量达70%，此类产品不贴“有机”标签，只能列表显示有机成分；“Containing organic ingredients”即有机含量低于70%，此类产品亦不能贴“有机”标签，只能列表。上述100%和95%以上有机食品可以贴上美国农业部的有机食品专用标签“USDA Organic”。
