Ask Dr. Jason Fung - if you have high levels of Cortisol and/or Insulin you can increase body weight despite fasting or low calorie diets.

The human body is not a closed system to the laws of thermodynamics don’t apply.

Not using this app much but this one time I come across this genuinely good comment. 😂😌

Perfect 👌🏼

Or, her calorie needs are just lower than expected.

You still know nothing about their rate of burning, so the law of thermodynamics is not being broken if their expenditure is still much lower than what little they are consuming

The human body is driven to hold onto fat when the risk of starvation increases. When calories in are very low, the body recognizes this as a famine and prioritizes holding onto fat. It doesn’t accomplish this by “breaking the laws of thermodynamics”, it down-regulates non-essential functions (i.e. reducing the calories out). This is observable: my nails and hair both grow noticeably slower when I’m in a calorie deficit and much quicker when I’m in a surplus. This is called energy partitioning.

You're assuming that her basal metabolic rate burns more than 1200 calories a day.

What do you think a metabolism is, just wondering

In this house we obey the laws of thermodynamics!