The causes of overnight 'weight gain'

Overnight weight gain can often be attributed to fluid retention rather than fat storage, and is usually temporary if you address the root causes.

But what causes overnight weight gain?

Dietary choices
Hormonal fluctuations
Other physiological processes

carbohydrates

Did you know that carbohydrates and glycogen storage play a role.

When you consume carbohydrates, your body breaks them down into glucose, which is either used for immediate energy or stored in the form of glycogen in the muscles and liver.

Except that each gram of glycogen is stored with water.

So when you consume a higher amount of carbs, your body retains more glycogen with water, leading to temporary weight gain due to increased water retention.

Other reasons for overnight weight gain include

High sodium intake, also causing your body to hold onto more water, leading to a temporary increase in weight
Hormonal fluctuations, especially in women during their menstrual cycle, can affect the body's water balance leading to water retention and weight gain
Alcohol can contribute to dehydration, and your body might retain more water to compensate for this dehydration
Injuries or inflammation in the body can cause fluid retention as the body repairs damaged tissues by funneling immune support and nutrients to the area.