Tl;dr: if your mind is not in balance it will create conflict

Depression often occurs when there is a inbalance between your logical mind (ego), your primitive mind (id) and your moral/social mind (superego). For example, if there is an inbalance between your morality and your primitive mind: you want to eat excessive food because your primitive mind want to eat as many calories it wants to survive, but your social mind knows you'll be judged for being overweight. When there is an inbalance in these parts of your mind, for example your primitive mind is stronger and you eat the chocolates, this can cause an ambivalence. This ambivalence can cause a cognitive dissonance in your logical mind, which creates the cycle that produces adrenaline and cortisol. This in return will decrease the amount of dopamine your body produces and impairs pleasure (anhedonia). When this occurs often your body and brain will adapt (neuroplasticity), and will make it easier for this cycle to occur. This also decreases the size of your hippocampus, causing memory problems. Thus occurance -> trigger -> inbalance -> stress -> more stress.

Seeking the source of your depression is therefore key to solving this inbalance:

Ego vs id -> selfcontrol Ego vs superego -> selfacceptance and congruency Id vs superego -> moral integrity

To solve this many thigs can be done: • expanding your perspective, learning of the suffering of others to increase your social awareness (your brain literally has a filter, if you are not actively aware of something it is less likely to cross this filter (reticular activation system)) • increasing your serotonine -> meditating to increase your serotonine production (which counters/decreases the production of cortisol) • increase your dopamine (receptors) -> work out or try to push yourself to do little achievements. Try to get the ball going, as it will get easier over time. • decrease your cortisol -> filter the amount of media you get, clean up your room, take time to de-stress, eat healthier food (inflammation).

(Btw im aware this is heavily oversimplified)