Why Do Some People Lose Weight Faster Than Others?

Let’s say you and a friend decide to start a get-healthy journey together. You both want to drop a few pounds, build your muscle strength and reap the energizing rewards in your work and personal life. Together, you create a game plan that maps out exercise, meal plans and strategies for resisting temptations when they inevitably come along.

Here, what you need to know about what’s happening under your hood.

Can you blame your mom for your constant cravings for doughnuts? Or your dad for the way you hold your weight around your tummy? Actually, sort of!

More than anything else, our genetics play a major role in our ability to lose weight, because they provide the blueprints our bodies run on. For example, some people have genetic single nucleotide polymorphisms (SNPs), which may be associated with an increased or decreased risk of being thin, Brigid Titgemeier, RDN, LD, an integrative functional nutritionist, tells LIVESTRONG.com.

Researchers are constantly studying this field of health, trying to identify ways people can overcome some of their genetic markers, says Titgemeier.

“The future of nutrigenomics and nutrigenetics is bright. This is the science of understanding how your diet impacts your genetics — by switching on or off various gene mutations that can increase or decrease risk of disease — and how your genetics impact your targeted nutritional needs,” she says.

You and your pal may have the same weight-loss goal, but chances are slim that you started from the same fat mass. What does that mean? Basically, we’re talking about your bodies’ muscle-to-fat ratios.

“If you do not properly manage stress, it will signal your body to hold onto every calorie that you eat.”

How you manage the stress in your life, from career to relationships and beyond, is another factor at work. How you process anxiety and stress triggers has an impact on how your body releases or holds onto weight, Titgemeier says.

“If you do not properly manage stress, it will signal your body to hold onto every calorie that you eat,” she says.

There’s a difference between giving 100 percent in your spin class and barely getting through it. How intensely we exercise and how much effort we put into our fitness programs can make or break our weight loss, because all of that calorie-burning fuels our metabolism, energy and other fat-burning processes.

On the other side, though, Reed notes that where we start from should be considered, too. If you went from no exercise to working out five days a week, and your friend was already exercising regularly, you may see results faster because you made a dramatic change.

Your fitness history also plays a role, Dueñas says. If you exercised regularly in the past, your muscle memory may kick into gear when you start up a routine again, making you likely to adapt to a higher-intensity program more quickly — and thus, shed weight at a faster rate, too.

Also known as BMR, your basal metabolic rate is how much energy your body needs to function at rest. This dictates your metabolism, which is the rate at which your body processes food for fuel (aka burns calories), says Audrey Heist, RD, director of health engagement at New Jersey’s AtlantiCare healthy system.

While your BMR is somewhat determined by genetics, it’s also tied to your age and how active you are each day. If you’re in your 40s and your friend hasn’t yet reached 30, for example, your metabolism will likely be slower, making it difficult for you to lose weight as quickly.

Unfortunately, there are some diseases out of our control that have a significant effect on how our body responds to diet and exercise. Diabetes is one of the major ones, Reed says, because it’s a condition in which the body does not use insulin correctly. Insulin is known as the “fat-storage hormone,” so this condition can make it tricky to maintain a healthy number on the scale.

And if you’re working hard and seeing little results, you may want to give some thought to any medications you may be taking, because they can cause you to retain extra pounds, too. A candid chat with your doctor is a good idea if you’re concerned about any potential medication side effects.

There’s a lot more happening in our stomachs and digestive tracts than most of us realize. In fact, Titgemeier says the large intestine alone includes trillions (yep, you read that right!) of bacteria, fungi and other organisms. Collectively, this is known as your gut microbiome.

“Research shows that the bacteria in your gut microbiome controls your metabolism of drugs and absorption of nutrients, directs two-thirds of your immune system and also plays a role in a person’s weight,” Titgemeier says.

In one February 2018 study in ‌Obesity‌, participants who had obesity were found to have lower levels of “good” bacteria and higher levels of “bad” bacteria in their guts. So, if you’re on a mission to lose weight and you aren’t giving your gut much TLC, you likely won’t see as much success. “The simplest way to start is to incorporate one to two fermented foods daily. Think sauerkraut, raw apple cider vinegar, kimchi and miso, just to name a few,” Titgemeier says.