The formula for losing weight is simple: Eat fewer calories than you burn. But the methods of doing this can vary. In truth, there is no one "best" way to lose weight — what works for you might not work for someone else. To get the lowdown on the latest science on weight loss, Live Science conducted a months-long search for the best information. We contacted nearly a dozen experts who have researched weight loss, and looked at the most well-regarded studies of weight loss done to date.
It’s certainly true – at least in theory and sometimes in practice – that all calories are created equal. “From the standpoint of body weight,” adds Marion Nestle, PhD, of NYU, “a calorie is a calorie no matter what it comes from. You can gain weight eating too much healthy food as well as unhealthy. From the standpoint of health, it’s better to eat your veggies…. It’s just a lot easier to overeat calories from junk food than healthy food. But it can be done.”
Alison Shipps, a NASM-certified personal trainer, says HIIT (high-intensity interval training) is the quickest and most effective type of training for speedy fat loss. "You don't have to spend hours in the gym to get results. Try doing several Tabata circuits—20 seconds of work, 10 seconds of rest, with 8 rounds. A few of these, and you'll be burning calories all day," she says.
Português: Perder 5 Quilos em Uma Semana, Italiano: Perdere Cinque Chili in una Settimana, Español: perder 10 libras en una semana, Deutsch: 4.5 Kilos in einer Woche verlieren, Français: perdre 5 kilos en une semaine, 中文: 在一周内瘦九斤, Nederlands: 5 kilo afvallen in een week, Русский: сбросить 4,5 килограмма за неделю, Bahasa Indonesia: Menurunkan Berat Badan 5 KG dalam Seminggu, Čeština: Jak zhubnout 5kg za týden, हिन्दी: एक हफ्ते में दस पाउंड कम करें, ไทย: ลดน้ำหนัก 5 กิโลในหนึ่งสัปดาห์, العربية: خسارة 4 كيلو جرام ونصف من وزنك في أسبوع, 한국어: 일주일에 4.5 kg 빼는 방법, Tiếng Việt: Giảm 5kg Trong một Tuần, 日本語: 一週間で5kg減量する, Türkçe: Bir Haftada 5 Kilo Nasıl Verilir
You already know that a perfect diet doesn't exist, but many of us still can't resist the urge to kick ourselves when we indulge, eat too much, or get thrown off course from restrictive diets. The problem: This only makes it more difficult, stressful, and downright impossible to lose weight. So rather than beating yourself up for eating foods you think you shouldn't, let it go. Treating yourself to about 200 calories worth of deliciousness each day — something that feels indulgent to you — can help you stay on track for the long-haul, so allow yourself to eat, breathe, and indulge. Food should be joyful, not agonizing!
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The final possible culprit behind stubborn weight issues may be the stress hormone, cortisol. Too much cortisol will increase hunger levels, bringing along subsequent weight gain. The most common cause of elevated cortisol is chronic stress and lack of sleep (see tip #10), or cortisone medication (tip #9). It’s a good idea to try your best to do something about this.
Sleeping early has a number of benefits. Early sleepers are less likely to overeat. Eating right and exercising will give you a flat belly only if you’re getting enough sleep. We know now for a fact that getting less sleep can jack up the levels of the stress hormone ‘cortisol’, which increases fat storage around one’s midriff. It has also been linked to increasing the levels of deep abdominal fat.

Losing water weight shouldn't be a major part of your weight loss regime, and will only get you temporary results, in addition to being only temporary weight loss you can experience serious health issues. The first would be dehydration, which, if it becomes severe can have long lasting effects. Your goals should be toward losing pounds from fat loss, this type of weight loss will be more permanent and will make you healthier along the way. A mildly dehydrated person will have lost 5 to 6 percent of their body weight, moderately dehydrated will jump to 7 to 10 percent, a severely dehydrated person will have lost more than 10 percent of their body weight and is in serious danger of health complications. .
While you wouldn’t have to be quite as restrictive to lose 10 pounds in two weeks, Gans says it would still require an extra level of dedication, and Feller recommends a diet that reduces caloric intake coupled with an exercise regimen that focuses on HIIT, strength training, and cardio. Why? “A lower ratio of carbohydrates and fats and a higher ratio of protein would help preserve lean body mass and promote the breakdown of fat mass,” she says. Your ratios might look something like 50 percent protein, 25 percent fat, and 25 percent carbs, although if you’re working out super hard, says Feller, you could decrease protein to 40 percent and increase your carbs to 35 percent for more easily accessible energy.
Are you like Old Faithful when it comes to your morning walk or evening jog? Know this: The more you do an activity, the more your body adapts to it, so you burn fewer calories. If you want to light a fire under your metabolism, consider cross-training. For example, if you normally walk, try biking instead. "Since you're not used to working all those different muscles, it's a more intense workout, which can translate into a greater metabolic after-burn because your body is working harder to recover and get oxygen to all your tissues," says Carol Espel, M.S., an exercise physiologist for Equinox Fitness Clubs in New York City.
You know that protein's essential for a slimmer you. But here's why protein really needs to play a prime roll on your plate: "Your body starts to produce more insulin as you age, since your muscle and fat cells aren't responding to it properly," explains Louis Aronne, M.D., director of the obesity clinic at Cornell University. Insulin promotes fat storage—especially around your belly—and a diet high in protein may protect you against insulin resistance, says Aronne. In one study, obese women who followed a diet for eight weeks that was roughly 30 perecent protein, 40 percent carbs, and 30 percent fat lost significantly more fat—including visceral pudge—than women who stuck to a plan that was 16 percent protein, 55 percent carbs, and 26 percent fat.

Protein is a fundamental part of a healthy and balanced diet, but when you are in the daily grind, you may not get the proper amounts, especially if your goal is weight loss. Protein not only helps keep you satisfied for longer, it also contains amino acids like leucine, which has been shown in research to aid in maintaining muscle during weight loss. <<<