The point at which unexplained weight loss becomes a medical concern is not exact. But many doctors agree that a medical evaluation is called for if you lose more than 5 percent of your weight in six months to a year, especially if you're an older adult. For example, a 5 percent weight loss in someone who is 160 pounds (72 kilograms) is 8 pounds (3.6 kilograms). In someone who is 200 pounds (90 kilograms), it's 10 pounds (4.5 kilograms).
Rise and shine—literally! Researchers from Northwest University found that people who were exposed to bright daylight earlier in the day tended to weigh less than those who didn’t get sunlight until later. So right after you wake up, open the blinds and let the sunshine in. Or better yet, step outside and enjoy your morning cup of coffee on the front porch
A randomized controlled trial done in 2016 showed that green tea helped in the treatment of obesity. Numerous supplements have been purported to help with weight loss, but most fail when tested in a scientifically rigorous manner. Many miracle diet pills have come and gone. There were the prescription drugs like Fen-Phen, which, like the old street drug ‘speed’ caused weight loss, but also caused all kinds of heart problems. Fen-Phen could make you thin, but could also kill you. There was Orlistat, which blocks fat absorption. It caused weight loss, but also some bothersome side effects like diarrhea from all that mal-absorbed fat. Best advice for Orlistat? Don’t wear white pants. Then there was Meridia, which caused weight loss, but a little side effect like heart attacks and strokes caused it to be discontinued.

Another popular mainstream diet, Dr. Barry Sears's plan is considered to be one of the first in the recent wave of "anti-inflammatory" plans. It sets you up for success by calibrating your plate to be a third protein and two-thirds carbohydrates (not starchy ones like potatoes, think colorful vegetables instead) with a little bit of MUFAs, or monounsaturated fatty acids (the good-for-you kind ) in the mix.
My exercise routine also underwent a gradual change. I started by walking on my lunch break and hiking to burn extra calories and boost my metabolism. After losing about 60 pounds, I began using an elliptical at the gym and was even running by the summer. By January 2010, I hit my goal weight of 145 pounds and ran my first half marathon the following spring! 
There was also weight loss supplements that wouldn’t kill you, but didn’t really work either. Green coffee, raspberry ketones and grapefruit extract all come to mind. They sound great, but they all turned out to be pure hype. One substance, though seems to have stood the test of time — green tea, with traditional Asian medicine touting the weight loss effects for thousands of years.
Too tired to hit the gym? This meal can help you out. Beef is rich in protein and iron, which your body uses to build red blood cells. They take oxygen to your organs, so falling short in those can zap your energy. Broccoli is the perfect side, because its vitamin C helps your body take in iron. A half-cup of this veggie has 65% of all the vitamin C you need in a day.
Notes: Chop the sweet potatoes and halve the Brussels sprouts, and place on a sheet pan. Drizzle with 2 teaspoons olive oil, season with salt and pepper, and toss to coat. Roast at 450°F (230°C) until tender, about 15 minutes. Brush the chicken with 1 teaspoon olive oil and season with salt and pepper. Grill over medium-high heat until marked and no longer pink in the center, about 5 minutes per side.
Sesame seeds likely aren’t one of those foods you pay any mind to, but the crunchy little buggers have been shown to play a crucial role in weight maintenance and deserve to be tossed into a salad or whole wheat noodle dish. Researchers suspect its the lignans—plant compounds—found in sesame seeds (and flax seeds) that makes them so special. In a 2015 study, women who consumed high levels of lignans tended to weigh less and gain less weight over time when compared to women who didn’t consume these compounds in high amounts.
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