I've spent the last 2 years fixing my understanding of what works, actually works, versus what works in a lab.
You wanna get super lean? That's a less than healthy run at macros followed by returning to a normal well balanced diet long term.
There's science and real world to back this that I'm skipping to get to the math...
Go calculate your TDEE
TDEE Calculator: Learn Your Total Daily Energy Expenditure
30yo, sedentary, 190lbs, 20% body fat.
2,231 calories.
Your goal? 10%.
190lbs * .80 = 152lbs of lean body mass (LBM)
You need to get to 152 lbs *1.1 = 167lbs to be the same LBM at 10%.
You need to lose around 20-23lbs.
You probably won't put on much LBM during such a cut. But you can get stronger.
So take your TDEE and subtract 500 calories or so = 1731 calories. Lets use an 1800 round number.
Weigh yourself empty same time every week.
Lift heavy
Do cardio 2-3 times a week steady state and HIIT.
Get a gram + of protein per LBM. I shoot higher. Lets say 175.
I find keeping my carbs up keeps up my energy on a cut. I can't do keto or low carb. I crash. But I can make gains on a cut with a lot of carbs, especially near workout time.
So calories =
175g protein = 175 *4 = 700
50g fat = 50*9 = 450
162g (the rest of your calories) carbs = 650
=====
1800 calories
Get some whey protein and carb right before working out. It'll change your bum life.
MOST people do better eating throughout the day, but the data says it doesn't matter. Just get your macros in a 24 hour period.
Get some long acting protein at night (egg or casein if youre doing a supplement but whey works better than nothing, just not as well.)
breakfast
eggs and carb
lunch
lean protein and veggies and carb
preworkout
whey and carbsx2
post workout dinner
lean protein veggies and carb
bedtime
long acting protein
Add in multivitamin because your goal isn't well roundness, its aggressive fat loss.
I'm boring. I just eat the same thing every day.
lean protein is fish or chicken or pork. I sometimes toss in lean red meat once a week or two.
Veggies all the time.
Carb is Daves Powerseed bread or oatmeal.
Long acting protein is plain fat free yogurt or cottage cheese or egg protein or casein.
I cheat one meal a week.
You need to count or you can't do this. Download myfitnesspal and log everything until you know your common routine.
You'll lose 1-2 lbs per week.
When you stop losing, cut out a piece of bread at two of your meals. then three of your meals. Then no carbs at dinner. Keep your protein high. When reading studies on low and high carb fat loss, the ONLY consistency in success is high protein.
At the end, reverse diet and start adding carbs back in slow over a couple weeks until your weight stabilizes.
On a bulk or maintenance all I do is eat a little more well rounded for health and increase my carbs. I'm never very heavy on my fats.