Hi, I'm 33 years old, weight: 253 lbs Height: 5" 9". Looking to loose weight, Started drinking Whey Protein Gold Standard Isolate (1 scoop, twice a day at 11:00am and 19:00 pm meals and excercise in between) Low carb diet (6 meals a day, counting those shakes) and after just 1 week i feel really lethargic and sluggish, sleepy, during the day (except when i do workouts) . Sometimes also a little bloated. Heart rate and blood preassure are normal. What could this possibly be? thanks!