Friday April 3, 2020

By Erin Hiatt

Does Cannabis Stay in Your System Longer if You're Overweight? Health/Science

Most cannabis consumers understand that THC stays in our bodies much longer than other substances, but are generally less clear about what factors make that so. But having a clear understanding of this is good practice, especially if you’re a regular consumer and a drug test is in your future. There are many factors that go into how long it will take to flush marijuana from your system, and a person’s body weight one of them. Before we dive deeper though, let’s take a quick tour of how cannabis works in our bodies.

How Cannabis Interacts in the Human Body

When cannabis is inhaled via smoking or vaporization, the cannabinoid responsible for that famous euphoria, THC, enters the bloodstream through the lungs (edibles through the stomach lining), then travels the bloodstream to the heart, which then pumps cannabinoids like THC, CBD, and others through the entire body and endocannabinoid system where it binds to cannabinoid receptors called CB1 and CB2.

As the blood continues to circulate, THC passes through the liver where it is broken down into a metabolite called THC-COOH. This metabolite is then stored in fat cells, which are gradually eliminated through normal bodily functions like urination and defecation. But, it’s not THC that drug tests are looking for, it’s the metabolite, THC-COOH, that hangs around in fat cells. So it’s perfectly logical to wonder, if I have more fat cells, will weed stay in my system longer?

Body Weight and Flushing Cannabis From Your System

The short answer is yes, but it’s a bit more complicated than that, because understanding body fat percentage entails more than just looking at a number on a scale.

How long THC metabolite lingers in fat cells is influenced by many factors, including age, consumption frequency and methods, product potency, gender, and general level of metabolism.

But how can you determine your actual percentage of body fat? For example, most body fat percentages are established by measuring height and weight on the BMI (body mass index). However, BMI is not a very accurate predictor of actual body fat because 1) it does not take into account those with more muscle mass who may weigh more than a less-muscled counterpart, and 2) It doesn’t account for “skinny fat“ folks, who probably look thin but have a higher percentage of body fat.

There are tests like skinfold caliper and hydrostatic weighing that can measure body fat percentages with some accuracy, which could give some indication of how long THC could stay in your body. However, there are a lot of variables, including:

Factors to Consider:

  • Potency: the more THC in the product, the longer it will take to metabolize
  • Gender: cisgender women tend to have a higher percentage of body fat than cisgender men, so THC-COOH will linger longer
  • Metabolism: metabolic rate is influenced by many things, including age, gender, muscle-to-fat ratio, hormone function, and how active you are
  • Frequency: THC stays in the system of frequent consumers longer than those who consume less regularly

Counterintuitively, hitting the gym ahead of a drug test will not necessarily help get THC-COOH out of your body any quicker. Yes, you will most certainly eliminate some fat cells in the process of exercising regularly. However, burning fat also releases THC metabolite into your bloodstream, so even if you are now thinner, the metabolite will still be detectable on a drug panel. Although cannabis affects everyone differently, some good tips for speeding up the cannabis cleansing process that have helped anecdotally in others are eating healthy and drinking lots of water. Of course, the number one rule for getting cannabis out of your system is to abstain from consuming!

Does weed stay in your system longer if you’re overweight? Yes. But don’t forget, it will stay in your system longer if you’re thin and consume frequently, or if you have a slower metabolism, or if you consume high potency products. So, whatever you do, consume thoughtfully.


Have you ever tried to flush marijuana out of your system? Share your experiences below. For tips and other helpful information on ridding your system of weed, click here.

Photo Credit: Siora Photography (license)


Erin Hiatt Erin Hiatt

Erin Hiatt is a New York City-based writer who has been covering the cannabis industry for more than six years. Her work - which has appeared in Hemp Connoisseur Magazine, PotGuide, Civilized, Vice, Freedom Leaf, MERRY JANE, Alternet, and CannaInvestor - covers a broad range of topics, including cannabis policy and law, CBD, hemp law and applications, science and technology, beauty, and psychedelics.

Erin's work and industry insights have been featured on the podcasts The Let's Go Eat Show, In the Know 420, and she has appeared as a featured panelist on the topic of hemp media. Erin has interviewed top industry experts such as Dr. Carl Hart, Ethan Nadelmann, Amanda Feilding, Mark A.R. Kleiman, Dr. James Fadiman, and culture icons Governor Jesse Ventura, and author Tom Robbins. You can follow her work on LinkedInWordpress, @erinhiatt on Twitter, and @erinisred on Instagram.



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