Tag: LifestyleMedicine

Weight Loss Surgery Options for Obesity Explained

On By Dr. Scott RennieIn Weight Loss & Metabolic HealthLeave a comment

Weight loss surgery, also called bariatric or metabolic surgery, is one of the most effective treatments available for severe obesity. Gastric bypass and sleeve gastrectomy are safer now than they have ever been, and demand keeps climbing. Surgery carries risk and requires a long-term commitment, and both belong in the conversation from the first visit.

Obesity affects more than 100 million U.S. adults, roughly 40.3% of the adult population, with 9.7% in the severe range (NCHS, NHANES August 2021 to August 2023). Type 2 diabetes, cardiovascular disease, cancer, and early death all track with excess weight. Lifestyle programs and medications help, and for many patients the results don’t hold. That is the gap surgery fills. The Swedish Obese Subjects study followed patients for over a decade and found surgery produced durable weight loss and lower mortality (Sjöström et al., NEJM, 2007), and a retrospective cohort found a 40% reduction in all-cause mortality after gastric bypass (Adams et al., NEJM, 2007).

So who qualifies? Under the 2022 ASMBS and IFSO guidelines, surgery is recommended for people with BMI over 35 regardless of comorbidity, and for BMI 30 to 34.9 in patients with metabolic disease that has not responded to medical therapy (Eisenberg et al., Surg Obes Relat Dis, 2022). That is a meaningful loosening from the 1991 NIH thresholds most clinicians still carry in their heads. There is no strict age cutoff, though surgeons approach adolescents and older adults with extra care.

Before surgery, patients go through a thorough workup: nutrition and psychology evaluations, cardiac and pulmonary assessment, sometimes a sleep study and endoscopy. Smoking cessation is required. Most insurers still ask for documentation of six months of supervised weight management, a requirement with no good evidence behind it that delays care for people who need it. That time does get used for preparation and education, which is the one argument in its favor.

Several procedures are available. Sleeve gastrectomy is the most common worldwide. About 80% of the stomach is removed, limiting intake and changing hunger hormones. Patients typically lose 55 to 60% of excess weight. The operation is shorter than bypass and hospital stays run one to two days. Worsening reflux is the main downside (Peterli et al., JAMA, 2018).

Roux-en-Y gastric bypass has decades of long-term data behind it. A small pouch connects to the small intestine, bypassing part of the digestive tract. Average weight loss runs 60 to 70% of excess weight, diabetes remission rates are high, and reflux often improves. Risks include vitamin deficiencies, marginal ulcers, and internal hernias (Higa et al., Surg Obes Relat Dis, 2011).

One anastomosis gastric bypass simplifies the technique and shows promising results for weight and comorbidities, with higher risk of bile reflux and deficiencies. Duodenal switch and SADI combine a sleeve with intestinal rerouting. These are the most powerful options for diabetes remission and weight loss and they demand the most careful long-term monitoring. Gastric banding is now rare. It once looked appealing because it was reversible and low-risk, and the weight loss proved modest while long-term reoperation rates ran high (Genco et al., Surg Obes Relat Dis, 2016).

The randomized evidence is strong. Trials by Mingrone, Schauer, and Ikramuddin all demonstrated higher diabetes remission with surgery than with medical therapy alone, and the Schauer and Mingrone cohorts held those differences out to five and ten years (Schauer et al., NEJM, 2012 and 2017; Mingrone et al., Lancet, 2015 and 2021; Ikramuddin et al., JAMA, 2018).

Weight regain happens. About one in five patients regains some weight after bypass, from changes in anatomy or lapses in eating and activity. Surgeons can offer revision: re-sleeving, converting sleeve to bypass, or tightening pouches. These get tailored to the individual.

Long-term success depends on follow-up. Regular labs, nutrition counseling, ongoing team support. Lifelong vitamin and mineral supplementation is required rather than optional. Behavioral support matters, because habits carry as much weight as anatomy over years.

Weight loss surgery is one of the most powerful tools we have for a disease that is otherwise progressive and difficult to manage. With careful preparation, modern technique, and sustained follow-up, patients see improvements in weight, health, and quality of life that few other interventions produce.

Scott Rennie, D.O.

References:

1. National Center for Health Statistics. Prevalence of Overweight, Obesity, and Severe Obesity Among Adults Age 20 and Older: United States, August 2021–August 2023. https://www.cdc.gov/nchs/data/hestat/obesity-adult-17-18/obesity-adult.htm

2. Sjöström L, et al. Effects of bariatric surgery on mortality in Swedish obese subjects. N Engl J Med. 2007;357(8):741-752. https://pubmed.ncbi.nlm.nih.gov/17715408/

3. Adams TD, et al. Long-term mortality after gastric bypass surgery. N Engl J Med. 2007;357(8):753-761. https://pubmed.ncbi.nlm.nih.gov/17715409/

4. Eisenberg D, et al. 2022 American Society for Metabolic and Bariatric Surgery (ASMBS) and International Federation for the Surgery of Obesity and Metabolic Disorders (IFSO) Indications for Metabolic and Bariatric Surgery. Surg Obes Relat Dis. 2022;18(12):1345-1356. https://pubmed.ncbi.nlm.nih.gov/36280539/

5. Schauer PR, et al. N Engl J Med. 2012;366(17):1567-1576; and N Engl J Med. 2017;376(7):641-651.

6. Mingrone G, et al. Lancet. 2015;386(9997):964-973; and Lancet. 2021;397(10271):293-304.

7. Ikramuddin S, et al. JAMA. 2018;319(3):266-278.

8. Peterli R, et al. Effect of Laparoscopic Sleeve Gastrectomy vs Laparoscopic Roux-en-Y Gastric Bypass on Weight Loss in Patients With Morbid Obesity: The SM-BOSS Randomized Clinical Trial. JAMA. 2018;319(3):255-265. https://pubmed.ncbi.nlm.nih.gov/29340679/

9. Higa K, et al. Surg Obes Relat Dis. 2011;7(4):516-525.

10. Genco A, et al. Surg Obes Relat Dis. 2016;12(10):1783-1788.

Board Certified in Obesity Medicine and Family Medicine

This blog is for educational purposes only and does not constitute individual medical advice. Always consult your own physician before making changes to your health, medications, or treatment plan.

Does Poor Sleep Make You Gain Weight? Sleep and Obesity

On By Dr. Scott RennieIn Weight Loss & Metabolic HealthLeave a comment

When we talk about weight management, the conversation centers on diet and exercise. Both are critical. Sleep gets skipped. The research keeps showing it as a major player in metabolism, appetite, and energy balance, and for patients working on weight, the link is worth understanding.

Sleep is a biologic state touching nearly every system. The American Academy of Sleep Medicine and the Sleep Research Society jointly recommend seven or more hours a night for adults, and their consensus statement links shorter sleep to weight gain and obesity among other outcomes (Watson et al., Sleep, 2015). Too little of it throws off hormones, eating patterns, and decision-making around food.

Short sleep tracks consistently with higher obesity risk. In a controlled crossover study, adults restricted to four hours a night for five nights consumed roughly 300 calories more per day than the same people sleeping nine hours, with the excess weighted toward fat and carbohydrate (St-Onge et al., Am J Clin Nutr, 2011). Sleep restriction raises ghrelin, which drives hunger, and lowers leptin, which signals fullness (Spiegel et al., Ann Intern Med, 2004). Patients also snack more often and stretch their eating window across the day (Barragan et al., J Clin Sleep Med, 2023).

Brain imaging helps explain it. After sleep loss, reward centers light up in response to images of calorie-dense food. People report stronger cravings and are willing to pay more for high-calorie options after a single bad night (St-Onge et al., Am J Clin Nutr, 2012; Rihm et al., J Neurosci, 2019). I have seen patients describe exactly this. Their self-control, as they put it, vanishes after a bad night.

Does less sleep burn more calories? Slightly, and it doesn’t help. Insufficient sleep raises total daily energy expenditure by about 5%, roughly 100 calories a day, and participants in that work ate well past the deficit and gained weight (Markwald et al., PNAS, 2013). More hours awake means more hours eating. The net energy balance goes the wrong direction.

Poor sleep also undermines weight loss efforts directly. In a calorie restriction study, participants with short sleep lost more lean mass and less fat than those sleeping adequately (Nedeltcheva et al., Ann Intern Med, 2010). Variable sleep patterns predict weaker weight loss and worse food choices (Papandreou et al., Int J Obes, 2020). Running the other way, a randomized trial extending habitual sleep by just over an hour reduced daily intake by about 270 calories and produced modest weight loss with no diet changes at all (Tasali et al., JAMA Intern Med, 2022). That trial is the one I find most useful with patients, because it asks for something people can actually do.

The practical implication is that sleep is an active part of metabolism rather than optional recovery time. I suggest patients track it alongside food and steps, the same way they might track blood pressure or glucose.

Simple things help. Consistent bed and wake times support circadian rhythm. A cool, dark, quiet room improves quality. Avoiding caffeine, alcohol, or heavy meals before bed makes a measurable difference. When patients wake in the night, I tell them not to lie there clock-watching. Getting up briefly, reading, and returning to bed when sleepy works better. Small adjustments, and they shift the trajectory.

For providers, the take-home is to ask about sleep the way we ask about diet or exercise. For patients, prioritizing it changes appetite, energy, and weight in ways that show up on a scale. Nutrition and activity matter enormously, and without adequate sleep the system is working against both.

Scott Rennie, D.O.

References:

1. Watson NF, et al. Recommended Amount of Sleep for a Healthy Adult: A Joint Consensus Statement of the American Academy of Sleep Medicine and Sleep Research Society. Sleep. 2015;38(6):843-844. https://pubmed.ncbi.nlm.nih.gov/26039963/

2. St-Onge MP, et al. Short sleep duration increases energy intakes but does not change energy expenditure in normal-weight individuals. Am J Clin Nutr. 2011;94(2):410-416. https://pubmed.ncbi.nlm.nih.gov/21715510/

3. Spiegel K, et al. Brief communication: Sleep curtailment in healthy young men is associated with decreased leptin levels, elevated ghrelin levels, and increased hunger and appetite. Ann Intern Med. 2004;141(11):846-850. https://pubmed.ncbi.nlm.nih.gov/15583226/

4. Barragan R, et al. J Clin Sleep Med. 2023;19(10):1785-1794.

5. St-Onge MP, et al. Sleep restriction leads to increased activation of brain regions sensitive to food stimuli. Am J Clin Nutr. 2012;95(4):818-824. https://pubmed.ncbi.nlm.nih.gov/22357722/

6. Rihm JS, et al. J Neurosci. 2019;39(5):888-899.

7. Markwald RR, et al. Impact of insufficient sleep on total daily energy expenditure, food intake, and weight gain. Proc Natl Acad Sci USA. 2013;110(14):5695-5700. https://pubmed.ncbi.nlm.nih.gov/23479616/

8. Nedeltcheva AV, et al. Insufficient sleep undermines dietary efforts to reduce adiposity. Ann Intern Med. 2010;153(7):435-441. https://pubmed.ncbi.nlm.nih.gov/20921542/

9. Papandreou C, et al. Int J Obes (Lond). 2020;44(6):1279-1285.

10. Tasali E, et al. Effect of Sleep Extension on Objectively Assessed Energy Intake Among Adults With Overweight in Real-life Settings: A Randomized Clinical Trial. JAMA Intern Med. 2022;182(4):365-374. https://pubmed.ncbi.nlm.nih.gov/35129580/

Board Certified in Obesity Medicine and Family Medicine

This blog is for educational purposes only and does not constitute individual medical advice. Always consult your own physician before making changes to your health, medications, or treatment plan.