Let's get something straight: if you're carrying more weight than you want to, it's not because you're lazy. It's not because you lack self-control. It's not because you ate too many snacks. The science is incredibly clear on this, and it's time someone told you the truth.
the genetic piece (it's bigger than you think)
Researchers have identified over 300 genes that influence body weight. Three hundred. These genes affect everything from how fast your metabolism runs, to how your body stores fat, to how strongly you feel hunger, to where on your body fat accumulates.
Studies of identical twins raised in different families show that genetics account for 40–70% of the variation in body weight. That means before you ever made a single food choice, your DNA had already set a strong trajectory for your body size.
the hormone piece
Your body has at least 20 different hormones that regulate hunger, fullness, metabolism, and fat storage. For some people, these hormones are calibrated differently. Not wrong, just different. Leptin resistance, elevated ghrelin, insulin sensitivity variations, cortisol patterns: all of these are biological, measurable, and not within your conscious control.
When adults say "just eat less and move more," they're ignoring the fact that your hormones are literally fighting against that advice. It's like telling someone with poor eyesight to "just see better."
the environment piece
You grew up in a world designed to make this harder. Ultra-processed foods engineered to override fullness signals. Larger portion sizes normalized everywhere. Less opportunity for natural movement built into daily life. Stress from school, social media, and social pressure, all of which trigger cortisol, which promotes fat storage.
None of this is your fault. You didn't design the food system. You didn't choose your genes. You didn't pick your hormones.
what this means for you
Knowing this isn't about making excuses. It's about accuracy. When you understand that your body weight is primarily driven by biology and environment, not character, you can stop blaming yourself and start looking for solutions that actually work with your body instead of against it.
The shame you might feel? That comes from a culture that hasn't caught up with the science. The science says: this is medical. This is biological. And there are medical, biological solutions.
the takeaway
over 300 genes, 20+ hormones, and an entire food environment shaped your body. none of that was your choice.