Explanation of Bodyweight Response
Below we explain why you might be gaining or losing weight at this stage.
If you're losing weight, that means you were previously probably eating more calories than you needed. You may feel hungry right now, but your body should adapt to the amount of food within a week or two. Hang in there! Hunger is sometimes a necessary part of losing weight, so try not to compensate with bigger portion sizes (even veggies).
If you're gaining weight, don't worry, nothing is wrong! It simply means you were likely under-eating before.
Because your body wasn't getting enough food, it adapted by slowing your metabolism and conserving any energy it could, especially by holding onto body fat (since fat calories have more energy content than protein or carbohydrate calories).
By now giving your body the energy it needs, it's learning to relax and rev up your metabolism again. (This is why many calorie-restricting diets might work at first, but stop showing progress after a few weeks - it's because your body goes into starvation mode and responds by getting better at holding onto fat.)
This temporary increase in weight is a healthy sign that we are repairing your metabolism, and will make it much easier to lose weight moving forward.
We know it can be uncomfortable or even discouraging to see your weight go up when you're staying on top of your new habits, but trust us that you're doing great things for your long-term health! For most people, their bodyweight stabilizes after a week or so, and then they start to lose weight.
Your metabolism as a campfire
Think of your metabolism as a campfire. During a fat loss phase you want a fire burning nice and hot to be able to consume lots of fuel. With a smoldering fire of a metabolism fat loss will be exceptionally challenging. If you've been under eating in the past, the best thing you can do for your body is to stoke the fire of your metabolism before shifting to a fat loss phase.