5 days a week in gym? What sort of program are u following tat requires that high frequency?

U probably should have known it when u asked

But he could be doing cardio between days of strength training

Lose weight is ur goal? Then switch to full body 3 times per week. All compound movement, bench press, squats, deadlifts n overhead press every single workout.  There is no telling how much u shud eat to lose weight. Given me, u shud start at the upper range like 2200-2300 n adjust from there.

You might want to have a look at this site. Contains many guidelines and FAQs about fitness. I started going to gym about 1 year ago but was doing the usual split (arms, chest,shoulders,legs day split). To be honest I wasn't very serious at the time and didn't have much progress. 2 months ago I decided to get serious and decided to follow the PPL(Push,Pull,Leg) program. Followed the program strictly and watched my diet, being diciplined and whatnot. Made great progress so far.

Remember though, be discipline with your diet AND watch your form, a good lifting form > heavy weight. Hope it helps!
https://www.reddit.com/r/Fitness/wiki/index

Full body is amazing, ditch the 5 days split, you dont need that much stimuli as a beginner yet. Eat at TDEE for the first few months first, later on go down on a deficit to take advantage of that newbie gains. Just a suggestion from me. All the best

Weight loss can be very fast if u go on a large calorie deficit ie like minus 20-25% of yr tdee but u will hit a wall faster as well. Experienced ppl will tell u go slow, n adjust accordingly. At least give yrself 2 weeks to find out yr maintenance calories intake based on weighing scale. If the scale is not moving, u know tats yr tdee calories.

Follow a good beginner program like starting strength 5x5. All the best in yr weight loss journey