Wear the Weight You Lost: A Weighted Vest May Blunt the Post-Diet Rebound in Older Adults

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#1

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A two-year follow-up of a small Wake Forest trial asked whether wearing a weighted vest while dieting helps older adults keep the weight off afterward. Eighteen adults in their early seventies, with obesity and arthritis, had lost about 10 to 11 kg on a six-month meal-replacement diet. Half of them had also worn a vest loaded to replace the weight they lost. About 19 months after the program ended, the diet-only group had regained everything, while the vest group was still 4.8 kg below its starting weight. The vest group’s resting metabolism barely fell during dieting. The diet-only group’s fell by about 240 kcal a day.

Losing weight is hard. Keeping it off is harder, and for older adults the rebound carries an extra cost, because regained weight can come back with proportionally more fat than was lost. A small study from Wake Forest University in North Carolina points to a low-tech way to tilt the odds: put the lost weight back on, in a vest.

The idea comes from the “gravitostat,” a hypothesis Swedish researchers proposed in 2018. In rodents, bone cells in the legs appear to sense how much weight the body carries and signal the brain to defend a set amount of fat. When a heavy capsule is implanted in a mouse, the animal sheds fat to compensate. If people have a similar sensor, dieting would register as lost load, and the body might respond by conserving energy and nudging appetite upward. A vest that restores the load could, in principle, blunt that response.

Carson DeLong, Kristen Beavers and colleagues went back to volunteers from an earlier trial in which older adults with obesity followed a six-month meal-replacement diet. Half were also asked to wear a vest for up to 10 hours a day, with weight added weekly to replace what they had lost. About two years after the start, 18 of the original 37 participants returned to be measured.

Both groups lost similar amounts during the diet, around 10 to 11 kg, or roughly 11 to 12 percent of body weight. The difference appeared later. By the two-year visit, the diet-only group had regained all of it and a little more. The vest group had regained only about half and was 4.8 kg below where it began.

The team suspects metabolism. Dieting usually lowers resting metabolic rate, the energy the body burns at rest, and that slowdown is often blamed for regain. In the diet-only group, resting metabolism dropped by about 240 kcal a day over six months. In the vest group it barely moved. Across all participants, people whose metabolism fell more during the diet tended to regain more afterward.

The caveats are large. With nine people per group, the weight difference could be chance, and its p-value of 0.10 misses the usual threshold. Only half the original volunteers came back, and they chose to. No one tracked diet, activity, or whether vest users kept wearing their vests. The vest also did not protect lean tissue: both groups lost about 3 kg of it. That makes the metabolic result harder to explain.

Still, the signal is not a one-off. The same group’s larger INVEST in Bone Health trial enrolled 150 older adults. A conference abstract covering a 21-person follow-up subset reported the same pattern: better-preserved resting metabolism with vests and less regain in the year after the program ended. That result is not yet peer reviewed, and it also fell short of statistical significance.

Other human tests of the gravitostat are mixed. A three-week Swedish trial found that heavy vests trimmed about 1.4 percent more body weight than light ones. A later five-week trial from the same group improved body composition without changing weight.

The appeal is obvious. A vest is cheap, needs no gym, and can be worn while doing the dishes. Whether it can do the heavy lifting of weight maintenance is a question only a properly sized trial can answer.

Actionable Insights

  • Treat a weighted vest as a low-cost experiment, not a proven tool. It was well tolerated in these trials, but its benefit for keeping weight off is unconfirmed.
  • How big could the benefit be? Two years out, vest wearers were about 5.7 kg (12.5 lb) lighter than diet-only participants. In standardized terms that difference is about 0.75, which statisticians would normally call moderate to large. With only nine people per group, though, the plausible true effect runs from about 1 kg worse to nearly 13 kg better, and small pilot studies usually overestimate.
  • The metabolic effect is the stronger number. During dieting, vest wearers burned about 220 kcal a day more at rest, roughly a slice of toast with peanut butter. Its standardized size (about 1.7) is very large, yet the difference had disappeared by two years.
  • Do not expect a vest to protect muscle. Both groups lost about 3 kg of lean mass. Progressive resistance training remains the better-supported option.
  • The trials used this protocol: add weight gradually, replacing half to most of what you lose, and wear the vest 6 to 8 hours a day while upright.
  • If you have knee or hip arthritis, ask a clinician first. This study did not report joint outcomes.

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4 Likes
#2

Personally, I feel like loaded vests are hard on the knees. Walking with a loaded vest puts way too much stress on the knee joints.

1 Like
#3

Wearing the weighted vest 10 hrs a day kinda defeats the purpose of losing the weight?

#4

Not at all. It is the presence of the adipocytes is the issue. In any event this has reminded me I have a weighted vest and I should find a sensible way of using it. I am celebrating 6 days of not drinking alcohol at the moment by having a drink so wearing the weighted vest is not a good idea.

#5

I guess this is rucking in disguise. 50% of the weight was regained. Does this scale with weight loss amount? No one is wearing a 100 lbs vest after losing that amount of weight.

2 Likes
#6

Fascinating. Any quantification of duration? That is, how long did they wear the vest over days/months, and each day?

#7

From Claude Opus 5.5 analysis of the study:

How long they wore it overall

Vests were worn only during the diet phase. The 2025 paper calls that phase “6 months,” but the parent paper describes it as a 22-week diet intervention targeting 10% weight loss at 1100 to 1300 kcal/day, so about 5 months. springer

After that, the vest was no longer part of the protocol. No one recorded whether participants kept wearing it during the roughly 20 months before the final visit.

How long each day

  • The prescription was up to 10 h/day during the most active part of the day, with a goal of at least half of waking hours. Wear time was built up progressively toward 10 hours/day, and weight was added weekly according to each person’s loss of body mass. researchgate
  • In the 18-person follow-up subset, average wear was 6.6 plus or minus 2.2 h/day.
  • In the full vest arm (n = 20), average wear was 6.7 plus or minus 2.2 hours/day, and the 10-hour goal was met on 67 plus or minus 22% of intervention days. springer
  • Those two numbers together hint at a near all-or-nothing pattern. If about two-thirds of days hit 10 hours and the overall average was 6.7, the remaining days contributed very little. This is my inference, not something the paper states. The target was also lower during the ramp-up weeks, so the math isn’t exact.
  • Rough cumulative dose: about 154 days at 6.7 h is roughly 1,000 hours of total wear, the equivalent of about 100 ten-hour days.

Load

At the end of the intervention, the full vest arm was carrying 13.8 plus or minus 5.6 lb (about 6.3 kg). The follow-up subset averaged 6.1 kg. researchgate

Against about 11 kg lost, that replaces only around 55% of the lost weight at the end. The time-averaged load was lower still, because the vest started nearly empty.

Tolerability was not trivial: five participants reported vest-related back pain or soreness. nih

What’s missing

Wear time came from self-reported logs. There were no sensors, no data on whether wear declined over the months, and no split between time standing and time sitting in the vest. The authors themselves flag that last gap.

How the dose compares with other vest trials

Study Duration of wear Daily target Achieved Load
This pilot (parent trial) 22 weeks, during diet only Up to 10 h 6.6 to 6.7 h/day Titrated weekly, cap 15% of baseline; about 6 kg at end
INVEST (n = 150) 12 months, during diet 8 h 7.1 plus or minus 1.5 h/day Started unloaded, increased weekly in 1/8-lb blocks to match weight loss, capped at 10% of baseline weight; 81.8% of lost weight replaced
Ohlsson 2020 3 weeks, no diet 8 h Self-logged Fixed 11% vs 1% of body weight
ATLAS 2025 5 weeks, no diet 8 h Self-logged Fixed 11% vs 1% of body weight

This pilot delivered less load and slightly less wear time than INVEST, yet both showed similar regain signals. Neither trial has published a within-group dose-response analysis linking wear time or load to weight regain.

The only dose-response data so far concern bone. In an INVEST secondary analysis, vest wearers who spent more of their day standing or stepping kept better bone mineral density. Nobody has yet shown whether more hours or more kilograms means less regain. PubMed Central

Sources:

2 Likes
#8

I’m not sure my knees would care what the weight consists of?

#9

@KarlT think the idea is that vest is in the same ballpark as the weight you lose from your body

So effect on knees should net net be better on your knees as you don’t wear the vest 100% of the time