It's a combination of:
- food quantity
- genetics
- physical activity or lack thereof
- food quality and make-up (plant / animal for instance)
- and an addictive element thrown in for some individuals
- food quantity
- genetics
- physical activity or lack thereof
- food quality and make-up (plant / animal for instance)
- and an addictive element thrown in for some individuals
- microbiome activities
- epigenetics
- what you eat at a young age