Losing weight too fast?

That is a lot, even for water weight. How much are you eating, are you eating back exercise calories?

What does your weight loss look like if you throw out the first week?

People typically lose a lot of water weight in the first week, and that can throw off the average.

ethalew01 wrote: »

I’m not eating back my exercise calories. After dinner is when I do my workouts and I stop eating all together after that. I’m worried about losing muscle mass

Not eating back the exercise calories as this site is designed / how your daily goal is calculated and losing weight too fast is known as cause and effect.

Eat more then your chances of muscle loss are vastly reduced.

A common recommended rule of thumb around here, to keep health risk odds on the manageable side, is to lose no more than 1% of current body weight per week, and probably less than that when within 50 pounds of goal.

That would be based on the weekly average after throwing out the first week or two of weight fluctuation or unusual loss rate (if you experience that), and looking at several weeks after the weirdness stops. (4-6 weeks is particularly important for premenopausal women, which you clearly aren't, because of monthly hormonal cycles and their effect on water weight).

I lost too fast briefly, because MFP materially underestimated my calorie needs (even with correct inputs). I felt great, until I didn't. Despite correcting as soon as I realized, I got weak and fatigued, from which it took several weeks to recover. I can't recommend undereating.