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Abstract

To examine whether baseline chronic stress, morning cortisol, and other appetite-related hormones (leptin, ghrelin, and insulin) predict future weight gain and food cravings in a naturalistic, longitudinal, 6-month follow-up study.A prospective community cohort of 339 adults (age 29.1 ± 9.0 years; BMI = 26.7 ± 5.4 kg/m2 ; 56.9% female; 70.2% white) completed assessments at baseline and 6-month follow-up. Fasting blood draws were used to assess cortisol and other appetite-related hormone levels at baseline. At baseline and follow-up, body weight was measured, and the Cumulative Adversity Interview and Food Craving Inventory were administered. Data were analyzed using linear mixed models adjusting for demographic and clinical covariates.Over the 6-month period, 49.9% of the sample gained weight. Food cravings and chronic stress decreased over 6 months (Ps < 0.05). However, after adjusting for covariates, individuals with higher baseline total ghrelin had significantly higher food cravings at 6 months (P = 0.04). Furthermore, higher cortisol, insulin, and chronic stress were each predictive of greater future weight gain (Ps < 0.05).These results suggest that ghrelin plays a role in increased food cravings and reward-driven eating behaviors. Studies are needed that examine the utility of stress reduction methods for normalizing disrupted cortisol responses and preventing future weight gain.

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Week 5: A little vacation

  • Weight (7d avg): 193.2lbs/87.6kg

  • RHR (7d avg): 56.7bpm

  • Calories In (7d avg): 1986kcal

  • Exercise (7d avg): 825kcal

  • Net Deficit (total): -2000kcal

  • 6x500m row sprints: 1:50.2

Notes:

As noted in my prior week, 3 months is a long time for sustained weight loss. And vacation time or life events happen. How do we build a a resilient routine that can handle some off days? My 7d weight average actually went up this week, even though my calorie counting showed I was still in a deficit. A reminder that these are estimates.

I was curious about the impacts of cortisol on weight loss. This 2010 study examined the impact of low calorie dieting on cortisol levels and no surprises

Restricting calories increased the total output of cortisol

The study concluded that stress from low calorie dieting could be counter productive to the goals of dieting. The stress hormone cortisol is of course notorious for driving weight gain. A study isn't required to show the value of vacations in reducing stress and cortisol, but here's one anyway.

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