Should you ever go off of this diet during the course of your lifespan, it’s also pretty likely that you’ll gain weight back (and then some), and that’s what I’m hoping to share with you by coming down hard on this trend — not because weight gain is "bad," but because weight-cycling is physiologically and psychologically damaging. Diets that single out a food group or macronutrient make it that much harder to get out of the purgatory induced by today’s diet landscape. They become recipes for feelings of failure, fear, and self-doubt when we can’t "stick to the plan," simply because the circumstances of our lives have changed!


The study began with 609 relatively healthy overweight and obese people, and 481 completed the whole year. For the first month, everyone did what they usually did. Then, for the next eight weeks, the low-fat group reduced their total fat intake to 20 grams per day, and the low-carb group reduced their total carbohydrate intake to 20 grams per day. These are incredibly restricted amounts, considering that there are 26 grams of carbs in the yogurt drink I’m enjoying as I write this, and 21 grams of fat in my half of the dark chocolate bar my husband and I split for dessert last night.
Regardless of which camp you're in, if you do decide to try out a low carb diet, the Atkins Diet is the gold standard. Atkins has been proven effective for both short- and long-term weight loss, and studies show it is just as effective in lowering cholesterol levels over the long term as low fat diets for many people. As with any diet program, it may not be effective for everyone. While Atkins does initially restrict carbs to very low levels, the plan adds in more carbohydrates as you lose weight. It's also easy to follow, say users, and it's restaurant friendly -- hold the bread and order an extra vegetable instead of a potato.
We all want a toned, flat stomach. No surprise there. But since many women are still relying on crunches to get it, we want to make one thing clear: Crunching is not the most effective abs workout. "Crunches work only the muscles on the front and sides of your abdomen, but it's important to target all the muscles of the core to get more defined abs—including lower back, hips, and upper thighs," says Lou Schuler, co-author of The New Rules of Lifting for Abs. (Also try these 20 tricks for engaging your core and getting a sneaky abs workout.)
If you’re already enjoying and eating foods high in fat along with protein, you might want to consider going on the keto diet. It’s been proven to be more effective at weight loss than a low-fat diet, and you’ll likely have an easy time transitioning to it. (9) Among my weight loss tips, going keto is the diet that produces the quickest results alongside significant health changes.
"About a year ago, I went to the doctor for my annual exam. I had just turned 30, and the number on the scale was the highest it had ever been, and my cholesterol was high," says Lauren Zarzour, 31. "I joined Weight Watchers and ClassPass. I'm now 30 pounds lighter and have developed a better understanding of nutrition and a passion for the gym. I've learned how much more you value food when every day isn't an indulgence, and how amazing it is to be strong. I wish I would have known how easy it could be, but I don't think it would have been easy if I hadn't had that epiphany." (Related: How to Rekindle Your Weight-Loss Motivation) 
Ready to step it up with your Fitbit tracker and set some new health and fitness goals? That’s awesome! Cue the fireworks! But if your ultimate goal is to lose weight, unfortunately, activity alone isn’t going to get you there—you also have to change what you eat. That does not mean you need to do a cleanse or detox. But it is possible to get a jump on weight loss, the smart and healthy way. Fitbit Dietitian Tracy Morris developed this kickstart one-week meal plan to help her clients see results, fast. Disclaimers: Please don’t try to lose more than 2 pounds per week, or dip below 1200 calories per day, which can compromise your metabolism. This is not a long-term plan, so you definitely don’t want to eat this way every week. But it’s a great way to kick off a weight loss goal, with specific meal and snack ideas, so you’ll see an initial drop—and be extra motivated to keep the momentum going this year. Increase your drive to succeed, and see how many consecutive days your can stay on track, by using Fitbit’s food logging feature.
This principle involves eating low-energy-dense foods and can help you lose weight by feeling full on fewer calories. Healthy choices in each of the other food groups in moderate amounts make up the rest of the pyramid — including whole-grain carbohydrates, lean sources of protein such as legumes, fish and low-fat dairy, and heart-healthy unsaturated fats.
Even better, once you start lifting challenging weights, you'll see major changes happen in your body, more than you do with cardio which burns calories but doesn't help you build muscle. Don't forget that you're building strong bones and preserving your muscle mass, which means you can control the weight gain that comes with age and lack of exercise.
Giancoli also recommends finding a diet that fits in with how you really live. She notes that if you enjoy going out to eat but try to commit to a diet that forbids you from ever going to a restaurant, you’re just going to cheat. “It’s not sustainable… You’re most likely going to have a healthier meal if you’re going to cook yourself, but you’re depriving yourself of that social interaction if you never go out.” To put it another way: Your eating practices shouldn’t isolate you or keep you from having fun.
Weight Watchers, which not only champions a sustainable diet but has sustained itself for over fifty years, is a favorite amongst nutritionists. Its practical, flexible philosophy of saving and splurging SmartPoints boils down to balancing out food choices. You can get tips, tools, and motivation by attending the traditional weekly meetings, or get the same resources through its user-friendly app. Either way, research proves that Weight Watchers’ social element supports weight loss. At about $4 a week, OnlinePlus costs about half as much as Meetings+OnlinePlus, which runs around $8 (your fees vary depending on the length of your commitment).

Like a marathoner stretching before the big run, eating half a grapefruit before a meal can enhance your body’s fat-burning performance. A study published in the journal Metabolism found that this “warm-up” tactic can help whittle your middle—by up to an inch—in just six weeks! The scientists attribute the powerful effects to the grapefruits’ fat-zapping phytochemicals. The fruit can interact negatively with certain medications, so as long as you get the green-light from your M.D, plan to have half of a grapefruit before your morning meal and add a few segments your starter salads to reap the benefits.
This high-fat, adequate-protein, low-carb fad diet sends the body into a state of ketosis, in which the body uses stored fat for energy. Research published in Clinical Cardiology suggests the ketogenic, or “keto,” diet can be an effective weight loss method, but to be successful, you must follow the plan consistently with no cheat days — otherwise, you’re just eating a high-fat diet that may be high in unhealthy fats for no reason. (1) (A pro tip? If you're planning on doing the diet, consider perusing this complete keto food list and reading up on the healthiest fats for keto diet followers.)
The popular "flat belly diets"embrace much of the wisdom found in eating a Mediterranean diet, which helps everything from brain health to hearth health. The basic premise for both diets is eat foods rich in monosaturated fatty acids (MUFA) that may help reduce your belly fat storage. MUFA-rich foods include olive oil, nuts and seeds, avocodos, and fish. Eating yogurt regularly has also been found to be helpful in reducing belly fat.
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