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Study Shows Long-Term Weight Gain Can Result From Just 1 Month of Overeating

Aug. 25, 2010 -- Overeating even for short periods of time appears to have long-term effects, according to a new study that lends some scientific oomph to the old saying about "a moment on the lips, forever on the hips."

''Our study suggests that a short period of hyper-alimentation [overeating] can have later long-term effects by increasing body weight and fat mass in normal-weight individuals," says researcher Asa Ernersson, a PhD student at Linkoping University in Sweden.

The study results aren't surprising, according to two experts who reviewed the findings for WebMD, and lend credibility to long-standing messages about moderation.

The study is published in Nutrition & Metabolism.

Effects of Overeating: Study Details

Ernersson tracked 18 men and women, average age 26, who increased their energy intake by about 70% and capped their physical activity at no more than 5,000 steps a day (roughly 2.5 miles) for four weeks.

''The participants' daily energy intake before the study was on average about 2,270 calories per day and during the intervention they increased their daily energy intake by an average of 70% compared to before the intervention," Ernersson tells WebMD.

That translates to nearly 4,000 calories a day.

The diet was not healthy. "During the intervention the diet was mainly from fast foods, [such] as hamburger, pizza and french fries," Ernersson says.

Ernersson evaluated weight, body mass index, and other data at the start of the study, after the four-week eating binge, again six and 12 months later, and two and a half years later. He compared the feasting group with another group of 18 (average age 25) who didn't feast or have a cap on their physical activity.

The results:

  • The feasting group gained an average of 14 pounds after their one-month binge, while body weight overall in the comparison group stayed the same.
  • At six months, the feasting participants had lost about 50% of the weight gain but still had higher body weight than they did at the study start. Five participants had returned to nearly the weight they had at the start.
  • At 12 months, the overall weight of the feasting group was still higher than at the study start.
  • At 2.5 years, the weight of the comparison group was the same overall, but those in the feasting group had a further rise. The average weight at study start -- 149 pounds -- had risen to an average of 160 pounds.
  • Fat mass also increased in those who feasted -- from 20% of total body weight to nearly 24% after one month. At 12 months, it went down to 22.6%, but was still higher than at the study start

The change in fat mass was larger than expected, according to Ernersson. "Based on this, it can be recommended to avoid very high food intake that might occur during shorter periods," Ernersson says. The researcher concedes that the study has limitations and that the findings need to be confirmed in future research.

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