Wont be the best answer but I just listen to my body. 

I try to do that in multiple ways though.

For example, two fruits I cannot eat are strawberries and apples. Immediately when I eat them, they bloat me. I note this and just stay away from what I know isn't working for me.

I'm also a 6'1 guy who is ~195 pounds and works out quite a bit. I eat about ~2 pounds of meat a day. If I am still hungry at the end of the day or I'm losing or gaining weight, that's another signal for me. 

My days usually work out something like this:

fasted workout in the AM

post workout: 
2 bananas with a good amount of honey and a medium glass of raw milk

lunch: 6 eggs with a half pound of beef (mix in liver here occasionally)
I have a  dessert with my lunch which is a bowl of frozen mangoes with a small glass of raw kefir (don't know why but this combo is delicious)

Dinner:
1-1.5 pounds of steak 
if I'm still very hungry after this I add another small glass of kefir or a medium glass of raw milk 
then to finish I have a cup of hot bone broth (usually chicken but sometimes its beef) 

I stay away from fruit at night and usually keep it to the first half of the day. If I'm hungry or gaining weight, I usually only touch the carbs portion. The beef stays consistent. If I'm super gassy from the milk, I know that day I drank too much. Happens rarely, though. 

 That sounds like a delicious meal set up. 

Bloating is a big issue for me as well and breaking out. I recently double confirmed that apples do break me out... and pretty sure strawberries do too + other seed rich berries or fruit. 

Curious why avoid fruit in the evening? 

I think I'd heard from Dave Aspree prior to going carnivore when speaking of detrimental effects he'd experienced with going full keto and instead was encouraging cyclical ketosis to have fruit at night as dessert. I think due to potential energy decline during the day and taking one out of ketosis (not sure).

Thank you, for sharing your exprience.  

 Nothing real scientific i just have found I sleep better when I keep it higher fat at night and stack my carbs earlier in the day and closer to my workouts 

 gonna try the fasted work out first thing in the morning... lately been trying to eat in the first half an hour of my day, my body has been feeling loved up when I do that!  

 Oh yeah, what's your fat intake like? 

 Just from the beef and the milk — I used to eat super fatter cuts but now I’ll maybe have a ribeye once a week and stick to leaner cuts like bistro and top sirloin 

I’m not keeping track of anything specific or counting macros 

 Yes I had similar issues but following Dr Cywes' advice messed me up even more. Professor Tim Noakes, his mentor and also a South African who taught him about low carb, disagrees with him. 

But I'm not here to try convince you. Rather to show people that this issue is not black and white one way or the other, but more nuanced. I think it would be much simpler if we're weren't all messed up by our modern toxic environments. It seems to make us all sensitive to different things which cause  various physical and mental issues.  

 Absolutely I know what works for me is to focus more holistically on what nature is telling us we should eat vs industrial sludge 

The majority of that being beef 

And for that we are on the same team 🤝

Glad you got something that worked for you