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Why love interests and preferences change throughout a person's life according to science

by Dr. Krishna Kumari Challa

Jun 2

Q: Parents give us lots of unwavered love throughout our lives.
But our love towards them changes when we meet a girl or a boy. When we marry them, they become more important than parents. Why is this?

Krishna: That depends on several things.
Let me explain using only science.
According to science, love interests change throughout your life because of shifting hormonal profiles, evolving attachment styles, and changing psychological priorities. As you age, the brain's reward system re-calibrates based on long-term survival, maturity, and relationship experiences. According to psychological and evolutionary science, love and romantic preferences shift over time due to maturation, changing life priorities, and shifts in mate-value. As we age, our brains and social circumstances evolve, causing us to reprioritize what we value in a person.

While Biochemistry and psychology deal with human emotions, there are other branches of them that influence human behaviour.

Several specialized branches and related fields dive deeper into the science of emotions:
Affective Neuroscience: The branch of neuroscience that studies the neural mechanisms of emotion, looking specifically at how the brain processes feelings, moods, and emotional responses. 
Psychophysiology: The study of the relationship between mental states (like emotions) and physiological responses (such as heart rate, hormone levels, and brain activity). 
Behavioural Psychology: Focuses on the observable actions and behaviors associated with human emotions.
Sociology of Emotions: Explores how human emotions are shaped, expressed, and regulated by social norms, culture, and society.

Young children love their parents unconditionally because  this deep bond is driven by biological wiring, constant presence, and the trust that their most basic physical and emotional needs will be consistently met. 

This intense attachment is fueled by several core factors:

Biological Wiring of the Brain: Children are born with an innate drive to attach to caregivers. This instinct ensures they are protected, fed, and taught how to navigate the world. 
The Safe Haven Effect: Parents act as an emotional anchor. When toddlers feel scared, overwhelmed, or tired, their parents are their secure base to retreat to for comfort and reassurance.
Trust and Consistency: By consistently responding to cries, feeding them, and providing comfort, parents build a deep sense of security. Love is a child's natural response to being consistently cared for.
Unconditional Positive Regard: Parents are often a child’s first experience of unconditional acceptance. This creates a powerful emotional loop where the child feels entirely safe being themselves. 

The primary hormone dictating the child and parent bond is often called the "love hormone". It is produced in the hypothalamus and released during close physical contact, such as hugging, breastfeeding, and eye contact. Oxytocin triggers feelings of trust and affection while calming the brain's stress response. 
Several other hormones and neurotransmitters also play vital roles in shaping this bond:
Dopamine: This is the brain's "reward" chemical. It floods the brain when interacting with your parents, creating intense feelings of pleasure and motivation that make you want to be near them. 
Prolactin: Known as the "mothering" hormone, it surges during pregnancy and childbirth. It is heavily involved in maternal behaviours, nurturing, and milk production. This hormone develops a deep bond between a child and its mother.
Endorphins: These act as natural painkillers and mood boosters. They promote feelings of closeness and are typically released during physical play, laughing, and comforting a crying child.
Cortisol: While primarily known as the "stress" hormone, moderate levels in both parents and children help trigger quick, protective responses to ensure safety. 

A child's emotional shift from parents to friends is a normal part of development. . 
Here are the primary psychological and social reasons for this shift:

Individuation and Identity: As children grow, they naturally distance themselves from parents to figure out who they are as individuals. Friends act as a mirror for them to test new ideas, beliefs, and behaviours without the pressure of family expectations. 
Peer Validation: Children crave acceptance from people experiencing the exact same life stages. Friends validate their feelings and experiences, offering a sense of equality and belonging that parents (as authority figures) cannot provide. 
Practice for Adult Relationships: Peer groups provide a safe space to learn conflict resolution, empathy, and social negotiation. It is a testing ground for managing social dynamics on their own. 
Shared Interests and Culture: Friends bond over shared hobbies, music, and cultural references that parents may not understand or share, deepening their emotional connection.

Then as your love hormones take hold as you reach puberty, your preferences too take a different route.

Several core factors explain why your romantic preferences evolve:

Neurological shifts: During adolescence and young adulthood, dopamine and testosterone drive a craving for novelty and intense passion . As individuals age, oxytocin and vasopressin—hormones linked to long-term bonding, trust, and stability—begin to take precedence. 
Brain development: The prefrontal cortex, which governs long-term planning and emotional regulation, continues to mature well into your mid-20s. This biological maturation changes what you value in a partner, shifting the focus from superficial traits to shared goals and values. 
Attachment theory: Experiences in prior relationships shape your attachment style (secure, anxious, or avoidant). As you learn about your own emotional needs and past relationship failures, you naturally change what you look for in a compatible partner.
Evolutionary priorities: In early adulthood, mate selection is often heavily influenced by physical vitality and fertility. In later stages, priorities naturally pivot toward finding a reliable partner with complementary skills for resource-sharing, parenting, or mutual support. 
These biological and psychological changes ensure that your romantic choices adapt to your personal growth and life circumstances.

However, no matter how much some individuals are influenced by friends and romantic partners, some still stay very attached to parents. These bonds between parents and their children become non-negotiable.  That depends on how your brain is circuited depending on the love, care and affection you received from your parents and the hormonal cues you got from them. If this gives you more satisfaction than others, no other bond can break it.

Each relationship (and its intensity) of an individual  has its origins in the biochemistry of the brain of that person.
How that biochemistry is developed and sculpted in a healthy and normal individual is entirely in his or her hands and those of around him/her!

Blind Love

Art work by Dr. Krishna Kumari Challa

( http://www.kkartfromscience.com )