Diet Rewards is a generic term for incentives such as cash payments to individuals to maintain good health and wellness by a healthy diet, particularly a diet aimed at reaching a healthy weight. This is a trend in both the US and the UK.    The Biggest Loser reality TV series has increased public awareness of the idea of losing weight for cash and the importance of regular weigh-ins.
Evidence of effectiveness
Several academic studies have concluded that financial incentives are effective for producing weight loss.    The Volpp study found that dieters with incentives were five times more likely to reach their goal. How incentives are delivered appears to play a role in their effectiveness, in a 2016 study premium adjustments were shown to be ineffective in driving weight loss, even when the incentive value was as high as $550. 
Organizations and programs
Direct to consumers
Among the current providers of weight loss incentives for consumers are:
- HealthyWage (US): Pays individuals $200 for losing 10% of their weight, and up to $1,000 for reaching a healthy weight. Founded in 2009, based in New York.
- Weigh and Win (Colorado, US): Programme that pays Coloradan citizens to lose weight. Sponsored by Kaiser Permanente health organisation and operated by Incentahealth.
- WeightLossWars (US): Website allows groups and individuals to set up and administer weight loss competitions, including for money. Founded in 2004, based in Texas.
- Dietbet (US): Website that organises weight loss competitions among friends to lose 8 lbs over 4 weeks. Founded in 2010, based in New York.
- Fatbet.net (US): Website allows individuals to set weight loss goals and arrange bets and competitions with friends.
- Weight Wins (UK): Provides personal incentive plans for individuals that pays them for each pound of weight loss plus a bonus for long-term success. Maximum reward £3,000 on a 24-month plan. Founded in 2008, based in London.
Providers of health and wellness incentives for consumers, including weight loss, include:
- stickK (US): Website where individuals commit to stopping smoking, losing weight, or other personal resolutions; if they fail, they surrender money to charity. Founded in 2007, based in New York.
- HealthRally (US): Website which permits friends to motivate one another to stop smoking, get in shape, or lose weight by pledging money and gifts. Founded in 2010, based in San Francisco.
- Zamzee (US): An online rewards programme for teens who earn credits for physical activity by wearing a personal activity meter. Founded in 2010, based in San Francisco.
Providers of weight loss incentive programmes to corporate employers include:
- Tangerine Wellness (US): Founded in 2004, based in New Hampshire.
- Incentahealth (US): Founded in 2004, based in Denver, Colorado.
- HealthyWage (US): Runs team weight loss competitions for companies. The team with the highest percentage weight loss wins, and gets $10,000. Founded in 2009, based in New York.
- Weight Wins (UK): Provides personal incentive plans via employers.
Providers of health incentive programmes to corporate employers include:
- PruHealth (Vitality programme) (UK): Private medical insurer that rewards clients’ employees for healthy behaviour with Vitality points for shopping.
- RedBrick Health (US)
- VAL Health (US): Runs behavioral economics based incentives for employers' existing health and wellness programs.
- Virgin Health Miles (US): Part of the Virgin Group.
- Sayre, Carolyn (2010-01-04). "A New Weight-Loss Plan: Getting Paid to Shed Pounds". Time Magazine. Retrieved 2012-05-27.
- Rosenberg, Tina (2011-11-15). "For Weight Loss, a Recipe of Teamwork and Trust". New York Times. Retrieved 2012-05-27.
- Owens, Claudia (2012-12-27). "A Diet Plan, Lesson for Successful & Effective Recipe". Green Health Line. Retrieved 2012-05-27.
- Finkelstein, E. A.; Linnan, L.A.; Tate, D.F.; Birken, B.E. (2007-09-01). "A pilot study testing the effect of different levels of financial incentives on weight loss among overweight employees". Journal of Occupational and Environmental Medicine. 49 (9): 981–999. doi:10.1097/JOM.0b013e31813c6dcb. ISSN 1076-2752. Retrieved 2012-03-31.
- Volpp, Kevin G; Leslie K John; Andrea B Troxel; Laurie Norton; Jennifer Fassbender; George Loewenstein (2008-10-12). "Financial Incentive-Based Approaches for Weight Loss A Randomized Trial". JAMA: The Journal of the American Medical Association. 300 (22): 2631–2637. doi:10.1001/jama.2008.804. ISSN 0098-7484. Retrieved 2012-03-31.
- Relton, Clare; Mark Strong; Jessica Li (2011-01-12). "The 'Pounds for Pounds' Weight Loss Financial Incentive Scheme: An Evaluation of a Pilot in NHS Eastern and Coastal Kent". Journal of Public Health. 33 (4): 536–542. doi:10.1093/pubmed/fdr030. ISSN 1741-3842. Retrieved 2012-03-31.
- Patel, M.S.; Asch, D.A.; Troxel, A.B.; Fletcher, M. (2016-01-01). "Premium-Based Financial Incentives Did Not Promote Workplace Weight Loss In A 2013–15 Study". Health Affairs. 35 (1): 71–79. doi:10.1377/hlthaff.2015.0945. ISSN 0278-2715. Retrieved 2017-09-14.