On the surface, I Love You, Man is about a friendly guy, Peter Klaven, who doesn't have any male friends. He is introduced to a world of brotherly love when his wedding plans force him to confront the fact that he has no best man. Consequently, he attempts to befriend other adult males in a process termed bromance, which is similar to the dating game with a few twists. After some hiccups Peter befriends/dates Sydney Fife. Sydney is goofily sentimental and piercingly honest. He is a farting, masturbating mass of maleness. He may very well be the hidden fantasy of every straight male, but he is not my point.
My point is that, on another level, this bromantic comedy astutely examines the nature of meaningful friendships, which, as it turns out, is a critical component of mental health. In our culture, the value of friendship is not appraised. It is either overlooked as a thing that falls by the wayside as one ages or dismissed as a hobby that one either does or does not enjoy. But we know from research that friendship is a significant buffer to mental illness. In fact, the presence of a single friend can make a world of difference. A quick tangent makes this clear.
Pathology is a recipe with four main ingredients - cognitive, affective behavioral and social processes all of which bi-directionally feed into each other. So, when your mother dies, for instance, and you become depressed and start to withdraw from the world a friend can pop over to your house to challenge your dysphoric beliefs about how life sucks (cognitive), push you out the door and into a pleasurable activity (behavioral) and remind you of your value to others (affective).
Now that we appreciate the deceivingly high value of meaningful friendship, a natural question arises: what makes for a meaningful friendship?
The Goofiness Factor: It is very important to get out of your head and into the moment. Research shows that rumination is a mental process that could not be worse for your heart or peace of mind. Peter is a worrier. But a few sessions of "slapping the base" and seizing with silliness to classic Rush hits in Sydney's garage effectively weaken his worriment. It is impossible to jam and also ruminate about daily stresses.
The Liberation Factor: It is very important to liberate yourself from negative thoughts and feelings. Research shows that suppressing what bothers us only makes the material more bothersome in the long run. Hanging out with Sydney becomes an opportunity for Peter to cathartically release all tensions. This point is vividly symbolized in the screaming sessions Peter and Sydney have under the Venice Beach pier.
The Balance Factor: Mental health is all about balance, the ability to find the dialectic between being safe and taking risks, for instance, and expressing feminine and masculine aspects of self. Sydney offers Peter an opportunity to be male, to ride motorcycles and discuss masturbation, adding a little risk-taking and masculinity to a life previously skewed toward the safety and femininity side of life.
In the end, we see that friendship has transformed Peter into a healthier version of himself. The friendship instills many facets of mental health: self-exploration (Sydney questions Peter's motives for marriage), overcoming fears (Sydney increases Peter's professional exposure as a real estate agent), finding balance (Peter's sense of masculinity increases) and gaining self-efficacy (Peter learns that he can make friends). Considering the lessons about friendship buried in the subtext, I Love You, Man could also be called, I Love You, Self.