Its not just deciding to not be depressed. Its about making making the conscious decision to make your life better instead of waiting for someone else to do it for you, and then doing it.
That's not what I'm talking about though. Making your life better in the manner you keep describing is addressing external factors.
No, the force of will part comes in when you make YOURSELF stop eating the pie.
OK, now my examples aren't working with me again. Yes, that is when 'sheer force of will comes in'. No, that was not Nadaka's original bit that I disagree with. As Nadaka's point I disagree with was summed up :
"Fake it till you make it really work." Nadaka was saying to change your life in the manner of surrounding yourself with and do happy things. In the fat example specifically, this is putting yourself into a "fit" environment and expecting to get fit when your behavior still leads you to be unfit. "Eating pie" is the "habit" which leads you to be "fat". Not eating the pie is self-behavioral modification, which is what I'm talking about.
Granted, I am talking about my specific case. So let me clarify what I was originally talking about since it spun off into a tangent:
In the event that external factors-
"
Get out and do stuff, change your scenery. Eat real food, not sugar and snacks but meat, vegetables and complex carbs. Exercise, feel real pain, gain real strength, it will help put your feelings in perspective. Talk to people, make some friends. Teach yourself something new." Addresses external factor sources of depression. Environment. Granted, these can make you feel happy, they do not always address the source of unhappiness.
-are NOT the root of the problem, and it is your habits and behavior, then addressing external factors to make yourself happy is just hanging a painting over a hole in a wall. You can not simply "
Decide to not be depressed" in that case. Self-behavioral modification is required, which is the equivalent of kicking a drug addiction. IE the specific case I mentioned earlier, with an OCD-like impulse to overly criticize one's-self. Doesn't matter how happy of a happy place or happy things the person is in or does, or how much they change their lives in any way, as long as they have that habit, they will be unhappy. Another example would be someone who still won't let something tragic go, well after any other normal person would.
The finite details of what I'm trying to differentiate here are pretty much moot with how many times I've tried to lay it out. I'm bored of this now. Basically though, what you said doesn't always work.