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If you feel like you have a harder time staying slim than your grandparents did at your age, you are right. We are about 10 percent heavier than people in the 80s, even when we eat the same foods and exercise just as much. This may be due to changes in lifestyle and environmental factors that impact our BMI, or body mass index.

Recent research by York University’s Faculty of Health shows it’s harder to maintain the same weight at a certain age than it was for someone 20 or 30 years ago. Even if you eat exactly the same macros (protein, fat, and carbs) and do the same amount and type of exercise, you are likely to be heavier than they were at your age.

In fact, with all factors accounted for, the predicted BMI has risen 2.3 points between 1988 and 2006.

According to study author Jennifer Kuk, “Our study results suggest that if you are 40 years old now, you’d have to eat even less and exercise more than if you were a 40-year-old in 1971, to prevent gaining weight. However, it also indicates there may be other specific changes contributing to the rise in obesity beyond just diet and exercise.”

Specific factors contribute to our increased BMI

Historically we tend to look only to dietary and exercise habits when we consider our weight or BMI (body mass index).

However, weight management is much more complex than watching what you eat and how much you work out. Our BMI is affected by many factors such as:

• Medication use
• Environmental toxins
• Genetics
• Meal timing
• Stress level
• Gut bacteria populations
• Nighttime light exposure

While the study’s authors admit we need more research to determine exactly how these factors play into the changed BMI picture, they suggest three main players:

Increased environmental toxins. Compared to 30 years ago, we are exposed to a higher level of environmental toxins such as pesticides, air pollution, heavy metals, flame retardants, plastics used for food storage, and more. These toxins put a heavy burden on the endocrine system, altering the hormonal processes that affect metabolism and weight management.

Increased use of prescription drugs. Since the 1970s our use of prescription drugs has risen dramatically. Many antidepressant drugs are linked with weight gain and are the most prescribed drugs in the US for people between 18 and 44.

Our gut microbiome has changed. The gut microbiome, or the community of good and bad bacteria that naturally inhabit the digestive tract, have changed dramatically since the 80’s.

Americans eat differently than they used to. The products we eat are more filled with antibiotics, pesticides, and other toxins; we eat more artificial sweeteners; and we eat more junk food. All of these factors may negatively affect our gut bacteria populations.

A hot topic of research, the gut microbiome is linked to more and more aspects of health and disease. We now know that some gut bacteria are linked with weight gain and obesity. In fact, doctors are even using fecal implantation — insertion of gut bacteria from a healthy slim patient into the gut of an unhealthy obese patient — to reduce chronic obesity.

Support your microbiome with SCFA

In functional medicine we consider the gut microbiome to be a foundation of health. An imbalanced gut microbiome can prevent you from healing from many health disorders, so it makes sense to do everything you can to support yours.

One important factor is oral tolerance, or the body’s ability to properly recognize food proteins. When we lose oral tolerance, the immune system mistakenly thinks more and more foods are pathogens, and we begin to have more food sensitivities, increased hormonal issues, increased autoimmunity, and imbalanced metabolism and weigh gain.

You can support oral tolerance by fixing leaky gut, supporting liver function, taming histamine reactions, reducing stress, and balancing blood sugar. But one of the best ways to support it is by providing your body with plenty of short-chain fatty acids (SCFA).

SCFA are powerful gut signaling compounds found in fruits and vegetables that affect not only the gut but also the brain and other parts of the body.

Your gut bacteria not only make SCFA, they also need them as fuel to produce more SCFA. The more you eat them, the more your good gut bacteria can outweigh the bad.

Three main SCFAs include:

• Butyrate
• Propionate
• Acetate

SCFA bind to cell receptors that control your hunger and appetite, turn off insulin resistance, and burn body fat more efficiently.

When you are low on SCFA you will:

• Have a larger appetite
• Be prone to insulin resistance (think pre-diabetes)
• Store body fat better than you burn it

When gut diversity is ruined, SCFA can’t signal properly and you end up with what we call an “obese microbiome.”

How to support SCFA

To support healthy levels of SCFA, adopt the following habits:

Eat abundant and varied produce. Eat plenty of diverse vegetables so your gut bacteria stay adept at recognizing many different food proteins. Aim for 7 to 9 servings a day. One serving consists of a half cup of chopped vegetable or one cup of shredded greens. Go easy on high-sugar fruits to keep your blood sugar stable.

Supplement with SCFA. You may benefit from also supplementing with butyrate, the main SCFA. Start with one capsule a day and work your way up to two capsules twice a day.

Boost glutathione levels. Glutathione is the master antioxidant that helps dampen inflammation, a main factor in loss of microbiome diversity. Take absorbable glutathione such as s-acetyl glutathione (regular glutathione isn’t absorbed well), or its precursors such as n-acetyl cysteine.

There are many other helpful ways to support a healthy microbiome. Contact my office to determine your microbiome health and how to improve it, so you can maintain a healthy weight.