Many patients will be in pain and have a loss of appetite after surgery.[26] Part of the body's response to surgery is to direct energy to wound healing, which increases the body's overall energy requirements.[26] Surgery affects nutritional status indirectly, particularly during the recovery period, as it can interfere with wound healing and other aspects of recovery.[26][30] Surgery directly affects nutritional status if a procedure permanently alters the digestive system.[26] Enteral nutrition (tube feeding) is often needed.[26] However a policy of 'nil by mouth' for all gastrointestinal surgery has not been shown to benefit, with some suggestion it might hinder recovery.[38][needs update]
Remember, belly fat is not just troublesome because it makes you unhappy when you look in the mirror. The excess weight around your middle that increases with every passing year can raise your risk of type 2 diabetes, heart disease, dementia, and more. But if you're wondering what you can do to prevent that, these tricks to lose belly fat fast can help a lot.

Fiber—both soluble and insoluble kinds—tends to fill you up so you don’t eat as much, and is prevalent in lower-calorie foods like fruits and vegetables. Though not all of them, Crandall cautions. “Lettuce does not have a ton of fiber” so you can’t get by on salad alone. She recommends adding one cup of fruit or vegetables to every meal or snack to meet your quota. Or try these fiber-filled recipes.
Trim Portions. If you did nothing else but reduce your portions by 10%-20%, you would lose weight. Most of the portions served both in restaurants and at home are bigger than you need. Pull out the measuring cups to get a handle on your usual portion sizes, and work on paring them down. Get instant portion control by using small bowls, plates, and cups, says Brian Wansink, PhD, author of Mindless Eating. You won't feel deprived because the food will look plentiful on dainty dishware.
Studies found that people who keep food diaries wind up eating about 15 percent less food than those who don’t. And, new research suggests logging what you eat is one of the most effective and easy ways to lose weight. Watch out for weekends: A University of North Carolina study found people tend to consume an extra 115 calories per weekend day, primarily from alcohol and fat.  Then cut out or down calories from spreads, dressings, sauces, condiments, drinks, and snacks; they could make the difference between weight gain and loss. Here are 50 easy ways to lose weight naturally.
Get all that? Basically, the differences between groups were minimal. Yes, the low-fat group dropped their daily fat intake and the low-carb group dropped their daily carb intake. But both groups ended up taking in 500 to 600 calories less per day than they had before, and both lost the same average amount of weight (12 pounds) over the course of a year. Those genetic and physical makeups didn’t result in any differences either. The only measure that was different was that the LDL (low density lipoprotein) was significantly lower in the low-fat group, and the HDL (high density lipoprotein) was significantly higher in the low-carb group.
We have reviewed online diet services for the past 11 years. In our most recent testing, we compared nine services by evaluating each program's features and having volunteers try out the services. We have determined that Weight Watchers is the best program overall because it truly helps you make dietary and exercise changes to improve your lifestyle and keep extra weight off for the long run. It comes with helpful tracking apps and boasts a strong online community where you can learn and share ideas with other service users. 
Tapsell, L. C., Dunning, A., Warensjo, E., Lyons-Wall, P., & Dehlsen, K. (2014). Effects of vegetable consumption on weight loss: A review of the evidence with implications for design of randomized controlled trials [Abstract]. Critical Reviews in Food Science and Nutrition, 54(12), 1529–1538. Retrieved from https://www.ncbi.nlm.nih.gov/pubmed/24580555
Want a flatter stomach? Look in your glass—milk and soda are two major causes of tummy inflation. Approximately 65 percent of the human population has a reduced ability to digest lactose after infancy, which means that your glass of warm milk before bed may be the reason you wake up with too-tight pajamas. And when it comes to soda, both regular and diet are belly busters both from the sweeteners used and the carbonation. Try eliminating these from your diet and see if it helps flatten your tummy.
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