You can start seeing some physical symptoms like weight gain, hair loss, and a significant decrease in muscle mass. And I don’t even have to mention erectile dysfunction!
There are also several mental symptoms like the inability to concentrate for long periods of time, or feeling less motivated in general. There are also things like depression that might be more linked to the negative physical symptoms.
Some behavioral symptoms can also be seen, where men might be more indecisive than they used to be or they might become more moody.
The first thing to do, is to start eating well balanced meals and cutting out junk food and alcohol. It is also useful to add onto this by working out more, and adding in plenty of weight training.