That's where it gets tricky, where Lantus isn't really ideal for the bodybuilding world imo. It's hard to explain.. with something like Humulog, you can dictate your diet and your macros around when you take it. You can even do that with Humulin R.. but the longer lasting it is, the more strict you have to be. Ideally, we utilize slin at certain key times to benefit the most from it.
Now on the other side of the spectrum, there are guys that take a slin shot 6-8 times a day, before every meal, every workout, ect. Something like Lantus could be ideal for them. But those guys are also on 10+iu of HGH daily which changes everything completely.
I would say taking Lantus would have the same effect as constantly drinking a mountain dew throughout the day.