Losing weight is more complicated than calories in/calories out. We now know that given the same exact food, one person can gain weight and another won't. Much of this has to do with our microbiomes.
What are our microbiomes? These are the billions of micro-organisms that live on and in our body. We acquire them at birth and they change throughout our lives depending on our environment. The human microbiome includes the genes of the microbes. Why is this significant? Because they outnumber our genes by 100 to 1, and while our genome is fixed, we have quite a bit of control over our microbiome.
These billions of organisms that our body hosts have an incredible capacity to influence how many calories we extract from food, our insulin and hormone production, and even what we crave. We used to think weight gain/loss was as simple as calories in versus calories out. We now know it is much more complicated than this.
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