yes it does matter when you do cardio.
lets say you do cardio at 1 pm. at 1230 you ate brown rice and lean ground beef. well at 1pm you you start up your cardio but your insulinlevels are elevated from you brown rice and your not going to burn fat your goign to burn up those carbs (first 20 minutes).
in my opinion... there are three times of day when cardio can be done... 1) morning on empty stomach 2) post workout epmty stomach 3) 1 hour before last meal of the day
that being said
if your on a KETO type of diet..where your running mainly pro/fat meals during the day.. then you cn throw all this out the window and do your cardio whenever youd like and as often as youd like...as long as its kept to low intensity like walking
shut the fuck up, you have no clue what your talking about in any of your posts.
you will indeed burn more fat if you do the cardio on an empty stomach in the morning, but over a 24 hour period no type of exercise can increase fat burning. (the rest of the day you will be burning more carbs and less fat inorder to compensate so at the end of the day it doesnt matter)
in other words; do the cardio whenever you want and make sure your in a caloric deficit at the end of the day (or whatever measurement period you wanna use), if fat loss is the goal.
it doesnt matter if you burn carbs or fat during your cardio. morning cardio is just a way to burn calories inorder create a caloric deficit, when dieting. (thats why it 'works'). but the same thing can be achieved by walking whenever you want.
and i dont recommend keto diets for several reasons: one reason is that for alot of people the workouts will go to hell ( =muscle loss because you wont be able to sustain lifting poundages....)
when you diet, keep some carbs in the diet to fuel you workouts.
can you get ripped using a keto diet? sure. but there are better methods.