The healthy halo effect is not limited to poor choices on side dishes.

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Price wars can have a healthy purging effect in cluttered markets and, at least in the short term, benefit consumers.

ECONOMIST: An old-fashioned price war | The

And where they are carried out, they seem to have a healthy dampening effect on otherwise rosy interpretations of the observations.

ECONOMIST: Social science

She said people in such industries had the "healthy worker effect", in which constant health awareness made them healthier than the average citizen.

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Dividend income may not be the only benefit: According to research from ING Bank, there appears to be a healthy dividend effect on stock outperformance in emerging Europe.

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So fundamentally healthy firms in effect subsidise the less sound.

ECONOMIST: American pensions

"We need to rule out that there is a not long-lasting effect in healthy people, " Volkow said.

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But there is little evidence that consuming probiotics has the tonic effect on healthy people that certain adverts suggest.

ECONOMIST: Modern medicine

Whatever Bowie was reading and imbibing during his sojourn in LA the effect was not healthy.

BBC: David Bowie

Housing health on its very best day is an effect of a healthy economy, not the driver of same.

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"Cutting down on drinking can have a big effect on weight loss or maintaining a healthy weight, " said Ms Mendoza.

BBC: Alcohol calories 'too often ignored'

The healthy main dish and the green salad are examples of the halo effect.

FORBES: The Health Halo Effect: Counteracting Candy With Diet Soda

Companies with less-healthy workers would save money by waiting for the law to take effect before renewing, the document showed.

WSJ: Some Small Firms Try Early Insurance Renewal to Blunt Health Law

The only bad news for seniors in the rules about to take effect is a change in benefits for those who still earn a healthy living.

FORBES: Seniors To See Improved Health Care Benefits In 2011