Use a calorie-needs calculator like LIVESTRONG.COM’s MyPlate app to figure out your daily calorie needs, then subtract calories to create your energy deficit. With an app like MyPlate, you can factor in your weight-loss goal, and it will tell you the exact number of calories (as well has how much fat, protein and carbohydrates) you need to reach that goal.
Do not try to lose weight too rapidly. Crash diets and diet pills that promise weight loss are usually bad for you and actually don't help keep the weight off in the long run. Resist the urge to take the "easy" way out and instead stick with a healthier lifestyle. This way you lose the weight and improve your health, helping you keep the weight off in a way that won't harm you in the long run.
Hello Dr. I was just curious as to why or if it is more efficient to do it this way and slowly decrease your water intake or if on the 4th day, rather than drinking .5gallons water, you instead; seized your water intake all together? wouldnt that make your body go into flushing mode sooner and harder and get water out for even longer? or is that more dangerous?

At rest, when oxygen is readily available, your body relies on fat for energy.  At higher intensity, when oxygen is limited and energy is needed more quickly, it relies on carbs. Your body also prefers fat at lower intensities because you have a less limited supply, compared to carbs that are not as efficiently stored in the body for reserve fuel. 
About: It may be tough to tell by looking at her photo (complete with a very toned tummy), but Hannah’s no stranger to gaining weight. She packed on about 50 pounds each time she became pregnant with her two kids until she eventually went from a size 4 to a size 12-14. The pregnancies also changed her body and made her unhappy with the way she looked. Ready for change, Hannah created a fitness and food plan for herself, stuck to it and noticed she slowly but surely lost weight and started to look more and more toned. Now she’s studying to be a personal trainer, and her blog is a place she shares all her fitness tips, nutrition ideas and motivation to help others lose weight too.

“Under normal conditions, humans absorb only about 80% of the nutrients from the food they eat,” says A. Roberto Frisancho, Ph.D., a weight-loss researcher at the University of Michigan. But, he says, when the body is deprived of nourishment, it becomes a super-efficient machine, pulling what nutrients it can from whatever food is consumed. Start eating again normally and your body may not catch up; instead it will continue to store food as fat.
Tina, that’s awesome. You said some things that rang true for me. At 53 years old, I was exercising plenty, but I love to eat! I was not good at portion control. personally I had to start intermittent fasting. I’ve lost ten lbs in the first few weeks, but have hit a plateau. What I am doing now is going more paleo, modified paleo. I also need to have more discipline in staying the course on exercising, which I love to do, but work often gets in the way. I came across a fitness /diet routine that is one of the most popular in the country , at the moment https://bit.ly/2LTeGBG, looks pretty good. Really it’s not rocket science, although we in the west make it hard. Eat whole foods in moderation, get enough rest, reduce stress, and exercise, not insanely, but regularly. Aerobics and some form of weight bearing exercise seems to be the best combination.

While toning your muscles is best achieved through exercise, ditching the fat that’s obscuring them starts in the kitchen. Luckily, one easy way to get the ball rolling on fat loss outside the gym is a habit you probably already have: drinking coffee. Research published in the American Journal of Clinical Nutrition reveals that obese study subjects whose diet was supplemented with caffeinated coffee significantly increased their metabolic rate, and subjects of an average weight shed more pounds, too.
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