Low metabolism, and protein, getting lean and HIIT questions

So a little background about me. From the age of fifteen to around age 20, I had lost a total of 45 lbs. At my highest I was 150 lbs, and at my lowest I was 103. My height is 5'2. After age 19, I was desperate to look thin, so I used to workout on the eliptical for 2 hours everyday and eat a meal once a day. I've also resorted to diet pills that literally almost made me faint while starving myself.

And all of these instances has caused serious metabolic damage. Now I don't know whether or not I had lost muscle during these starving and exercising instances or not, but my body looks not very different from 103 to 110, and now to 123 lbs. My body composition is very similar, but my breasts got larger.

I also was a vegeterian for some time, and stopped being one recently

After age 21, psychologically my attitude towards keeping fit got healthier. I had stopped going to the gym but also made sure I didn't eat over my TDEE and would do HIIT 2-6 times a month.

But here I am at 123 lbs, feeling awful about myself. So I went and bought a air walker, and started doing HIIT workouts. It's been a week so far of me working out but I want to get lean as I feel like that's the best option for me especially since my arms hold a lot of fat.

So I had questions in regards to the getting lean, weight loss process so life isn't so hard for me in the future after I do lose weight/get lean.
I would appreciate whoever takes the time and answers these questions. Thank you.

Question 1: I would need about 120-123 grams of protein a day if I want to gain muscle. I can't afford that much protein. I can however afford at least 50 grams of protein. Would that work? Let's say I do a lot of strength training but I eat only 50 grams a day, would the muscle gaining effect be 0.5 lbs a month vs 1 lb? I'm a female by the way.

Question 2: I have both 5 lbs and 10 lbs dumbbell, do I need to do heavy weight lifting to gain muscle as a female and as a beginner?

Question 3: Don't you guys ever fear that eating that much protein that requires so much calories along with carbs will cause an increase in weight instead of getting lean because that's literally my worst fear.

Question 4: This is about HIIT and EPOC. There is this youtuber that claimed if you do a HIIT session of sprints for 12 minutes, afterwards you'll lose 1000 calories that day? So what I do instead is burpees, jump squats, and jump on boxes for 12 minutes for my HIIT this week. What are your thoughts and experiences with HIIT and EPOC especially HIIT that uses your highest heart rate in the process?

Question 5: Does HIIT help in building muscle?

A general question: Unless you're naturally skinny, is the celebrity type fit body with flat stomach even attainable without a chef and personal trainer?

BTW I absolutely love my caffeine and chocolate.


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