These economies are now struggling with aging populations and the burden of fiscal over-indulgence.

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In addition, stress can lead to over-indulgence in unhealthy habits, such as overeating, smoking and drinking, the health effects of which are well-documented.

BBC: Stress: The effects

Or just a gifted but reckless rock band, toppling over into self-indulgence?

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"Self-centered indulgence, pride and a lack of shame over sin are now emblems of the American lifestyle, " Graham wrote.

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