A daily weight fluctuation of 5-6 pounds is completely normal [*], largely due to variations in food intake and water consumption. For a more accurate representation of your weight change, you should weigh yourself at the exact same time each day.
Why is my weight going up on keto?
People who consume too many calories may gain weight, even if they are in a state of ketosis. High fat foods tend to contain many more calories than foods that are high in carbohydrates and proteins. It is, therefore, important that people keep track of the number of calories that they consume.
How often should I weigh myself on keto diet?
Instead, they recommend stepping on the scales once per week or even less frequently. Our weight fluctuates somewhat from day-to-day, and daily weighing can lead to discouragement and potential diet sabotage if you see a higher number on the scale than you saw the day before.