Does the walking calorie burning calculator work?

Today I have eaten 366 calories but in the morning I fast walked 3 miles, in the calculator it said I burned 491 calories depending on my weight and how fast I walked? Is this possible? Should I eat first and then walk the calories off? Im in a diet btw no sweets no greasy foods just lettuce tuna boiled chicken fruits and vegetables and such

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Sure, what you suggest is possible in theory. It's not good in practice, however, because it only teaches you that exercise is a crutch to be used to enjoy excess in eating. What exercise should be about is fitness, not fat loss.The key to fat loss is not exercise, it's diet.Any exercise will burn calories but no exercise will burn fat unless your diet allows it. You can burn fat in your sleep or you can run all day and never burn any fat. It all depends on your diet. Fat loss is determined by calorie control, not by exercise. Good exercises for burning calories are speed walking, biking, swimming, dancing, etc. and ANY other physical activity which makes you move a lot of weight for a long time. But NO exercise is good for burning fat if you eat too many calories because you can always eat more calories than you can burn but you can't always burn as many as you take in.Too many people waste energy and time because they do not understand this one simple point. The result is too often giving up in frustration, abandoning gym memberships they continue to pay for, and many other unnecessary problems not the least of which is a lack of success. An average person must walk about five miles every day for a week to burn the calories equivalent to a pound of body fat. So, unless you think walking about five miles a day (or doing an equivalent amount of exercise) with no guarantee of fat loss makes sense, focus your fat loss program on diet.Diet for fat loss. Exercise for fitness. To find out how the best minds in nutrition in the world (at the US NIH) have recommended for decades we lose fat, read my answer about how to lose fat --> http://answers.yahoo.com/question/index;_ylt=As615QJM4X_3ID9_05qmmlXty6IX;_ylv=3?qid=20111028185603AAVcP4D Good luck and good health!!♠PS: Here are some good websites you may find useful.• BEST SEARCH ENGINE http://www.usa.gov• A MUST FOR DIETERS http://www.freedieting.com/• BEST DIET TOOL ON THE WEB http://www.myfitnesspal.com/• BEST FOODS FOR YOU http://www.choosemyplate.gov/index.html• NUTRITION DOT GOV http://www.nal.usda.gov/food-and-nutrition