Your body will need about 3-5 weeks to transition to keton body use. Your glycogen stores will remain depleted until then and exercise will force your body to degrade your muscles and use the protein for gluconeogenesis. So, don't exercise in the beginning and eat a bit more if you do later. You may anyways need more than the three packages in the beginning.
Cramping is a sign of imbalanced electrolytes. I found that I could do strength training (I did not do cardio), but was more prone to cramping than before. Though I had less soreness since you produce less lactate when in ketosis. Maybe schedule your CalMag and potassium around exercise in the future. Fatigue may be temporally until your body gets used to living in ketosis. Hair loss may also just be because of the shock to moving to a low calorie diet. I think a lot of people take biotin or B12.
I was also fatigued and it did not go away. But I got into trouble after several weeks with the low carbs that you get with an IP diet. I think it had to do with me being subclinical hypothyroid before going onto this diet. Besides fatigue, I experienced hunger pangs, depression, skin itching, and the accumulation of cholesterol deposits around my eyelids. I did not know at the time that low carb directly affects the synthesis of hormones and indirectly the conversion of inactive T4 to active T3 in the liver. If you already are hypo, this may result in low T3 levels and also affect progesterone/estrogen synthesis. So, you may want to test free T3 levels/do comprehensive lab tests from time to time if the initial fatigue does not improve or if you get additional symptoms. I now completely stopped low carb for the moment for these reasons even though I loved what ketosis did and my weight loss was significantly accelerated by lowering carbs.
I would say you need to be actively involved in monitoring your health and/or consult a doctor at the beginning, after appropriate intervals and at the end of this diet. I learned a lot about the good, the bad, and the ugly of low carb eating. It is preferable to avoid the uglies.
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