Do not use the OPTAVIA Program if you are pregnant. If you have a serious acute or chronic illness (e.g., heart attack, diabetes, cancer, liver disease, kidney disease, anorexia, bulimia, etc.) do not use the OPTAVIA Program until your healthcare provider says you have recovered or that your condition is stabilized. The Optimal Weight 5 & 1 Plan™ is NOT appropriate for teens (13 to 18 years of age), sedentary older adults (65 years and older), nursing mothers, people with gout, some people with diabetes, and those who exercise more than 45 minutes per day. For special medical or dietary needs, refer to our program guides online.

A recent study in the journal Obesity found that obese adults who drank about 16 oz of water 30 minutes before their main meals experienced moderate weight loss compared to a group who didn't drink before their meal. Why? For one, water starts filling you up and might help reduce your appetite. Second, another study published in the Journal of Clinical Endocrinology and Metabolism found that that drinking about 17 oz of water increases metabolic rate by 30 percent in healthy men and women, and that this metabolic surge reached a maximum 30 to 40 minutes after drinking. Chug a few glasses of water 30 minutes before your meal, and you're prepping your metabolism to rev just in time for food consumption. 
“It’s far more difficult to eat a healthier diet and fit in exercise if you don’t plan ahead. Plan out your meals for the week ahead and go grocery shopping over the weekend to ensure you have the ingredients you need on hand. If you can, do some meal prep in your down time—cut fresh veggies, marinate your protein, cook up a batch of whole grains in advance. When you’re prepared you’re far less likely to order takeout. — Jessica Fishman Levinson, MS, RDN, CDN, culinary-nutrition consultant and founder of Nutritioulicious
Lowering sodium intake to less than 2,300 milligrams, (less than 1,500 milligrams for older adults, African Americans, or those with health conditions that increase risk for high blood pressure), is also an important component of a healthful diet. Foods high in sodium are often processed, pre-packaged, and may have more calories from added fats and refined sugar. For more information on sodium, see fact sheet Sodium and the Diet.
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!
Ultimately, weight loss for the long-term requires some short-term behavior change and healthier habit formation. That's why we created our Good Housekeeping Nutritionist Approved Emblem, which exists to help turn smart food choices into healthier eating habits. All GHNA foods and drinks make it easier to find — and eat — good-for-you foods without additional time, effort, and cost. We target the lifestyle-related factors that make healthier eating hard, and find simple but creative solutions that actually work! Look for the emblem on labels wherever you shop for food!
Caloric intake: While it is true that less calories usually means more weight loss, some diet plans are strict and can leave you feeling hungry most of the time. Additionally, some people need more calories because of metabolic issues or high activity levels, and low-calorie plans might be insufficient. Think about whether a diet plan will keep you full.
Being fit gives you a distinct metabolic advantage at a cellular level. Fit people have a greater number of mitochondria — the energy factories within our cells. Mitochondria handle the aerobic oxidation of fatty acids (fat burning!) that occurs even when we’re at rest. Thus, increasing the number of mitochondria through exercise helps raise our metabolism so we burn more calories — not only with every workout session, but also when we’re not exercising at all.
Athletes at their prime must consume many more calories than the average person to be at peak performance, but as they age and become less active may find that their old eating habits are hard to break. Former athletes who have gained weight and want to become lean and muscular as they age may turn to weight loss programs for help getting on track.
A new German study found that when you drink 17 ounces of water (about two glasses) within a certain time frame, your metabolic rate shoots up by about 30 percent. Using these results, they estimate that by increasing your current water intake by 1.5 liters a day, a person would burn an extra 17,400 calories a year, resulting in about a five-pound weight loss.
“The best thing you can do for your belly is to give up processed foods. A study in the journal Food Nutrition Research found that our bodies burn only 50 percent as many calories digesting processed foods as they do real foods. So it’s like eating twice as much, even if the calories are the same!” — Mark Langowski, celebrity trainer and author of  Eat This, Not That! for Abs
The figure determined by the Lose 1 Pound a Week Calculator is an estimate. There are several factors that can hinder weight loss including certain illnesses and medications. Always consult your doctor with questions about your individual condition(s) and/or circumstances before beginning any weight loss plan. This tool has been reviewed by doctors and is for general educational purposes only. It is not a substitute for medical advice. The information in this tool should not be relied upon to make decisions about your health.
“If a client has come to me looking to lose 10 pounds, I would tell them to simply move. Move more, and more often. Walk or bike ride to class or work, even park further away from your location in the parking lot. Take the stairs or take a walk during lunch. You don’t have to spend hours every day in the gym sweating, but you do have to make a conscious effort to move more, and sit less. This works great because it doesn’t feel like work and you’re burning more and more calories throughout the day.” — Ajia Cherry, personal trainer and Founder at Functional Innovative Training
While the American College of Sports Medicine warns that women who eat less than 1,300 calories a day and men who eat less than 1,800 risk slowing down their metabolism over time. But a rev-up stage that only lasts two weeks is approved by doctors and isn’t as difficult as it seems. Our tester found the Mayo Clinic day pretty satisfying, and still had enough energy to hit the gym.
Remember: All foods, including "healthful foods," should be consumed in moderation, and distinctions can often be misleading since even natural foods like fruits can have large amounts of sugar, and foods labeled as "health foods" such as low-calorie foods, reduced-fat foods, etc. can potentially replace one unhealthy component with another. Many reduced-fat foods for example have large amounts of added sugar to compensate for taste lost through fat reduction. It is important to pay attention to, and consider the different components in a food product in order to determine whether said food deserves a place within your diet.
Sure, you certainly need to drink plenty of water to help expedite the process of ridding your body of excess sodium, you can (and should!) also consume high-water content foods. Reach for cucumbers, tomatoes, watermelon, asparagus, grapes, celery, artichokes, pineapple, and cranberries — all of which contain diuretic properties that will also help you stay full due to their higher fiber content.

One easy trick if you're a pasta fan is to swap out white pasta for the wonderfully named courgetti (spaghetti made from spiralizing courgette). You’ll hardly notice the difference when you’re eating it, but you’ll be fuller for longer despite consuming fewer calories. When you consume fewer calories, your body can go to your fat reserves for energy, rather than just burning off the food you’ve eaten.  
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