In nutrition, suppliers know how to sell sugar and salt heavy foods and sugar substitute foods.

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The unit sells sugar substitute Splenda, Lactaid lactose-free milk products and dietary supplements.

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When the video was over, half of each group was given a glass of lemonade with sugar in it and half was given a glass of lemonade with sugar substitute.

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By 2007 Splenda had seized 61% of sugar-substitute sales in grocery and drug stores according to Information Resources Inc, a research firm.

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They are generally less sweet than sucrose (table sugar), so they are often mixed with very sweet artificial sweeteners like aspartame, sucralose and acesulfame potassium, to form a palatable substitute in low sugar, low carbohydrate, and diabetic or "diet" products.

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Add to the mix Thai chilies, for heat (if you can't find Thai chilies, the more ubiquitous red chili sauce found in Asian markets makes a fine substitute), and a moderate amount of sugar, for balance, and you have a zippy vinaigrette that dresses a beautiful salad of shallots, mint, cilantro, scallions and toasted rice.

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