Sometimes nothing hits the spot like a classic sandwich — and The National Institute of Health says nearly 47% of Americans eat at least one sandwich every day.
However, researchers and health commentators are raising concerns for frequent sandwich eaters — particularly those who reach for white bread.
Gary Brecka, a human biologist, self-described “professional biohacker,” and co-founder of the 10X Health System, has issued a pointed warning for people who regularly indulge.
Brecka is widely recognized for work connected to the “methylation movement,” where he focuses on epigenetics, DNA testing, and functional medicine approaches aimed at improving lifespan, performance, and overall health.
While appearing on George Janko’s podcast, Brecka delivered the warning in blunt terms: “The whiter the bread, the faster you’re dead.”
He was referencing the use of flour-bleaching chemicals in many commercial baking operations in the US, noting that some of these substances are flagged as “toxic” by the federal Food and Drug Administration (FDA).
He said: “The only bread I eat is sourdough, because the whiter the bread, the faster you’re dead. So white bread is enriched with bleach flour. Actual bleach.”
Host George responds: “Dude, it sounds like a joke. When you hear this out loud, it sounds like there’s somebody in the kitchen asking, ‘how do we kill these kids?’
“And they’re like, they are getting too old. Let’s try bleach.”
Brecka responds: “That’s right, the money is in the food leading to medicine, right? You don’t want to create sudden death.
“You want to create a long, agonising, chronic condition that you can manage.
“You want to create inflammation so you can manage it with an anti-inflammatory, you want to create a gut dysbiosis so you can manage the mental illness that comes from that.”
Separately, the National Institute of Health explains the broader health relevance of the gut microbiome: “Gut dysbiosis, an imbalance in the microbial makeup of your digestive tract, is closely tied to mental health through the bidirectional gut-brain axis.
“This imbalance triggers neuroinflammation and disrupts neurotransmitter production (like serotonin and GABA), potentially worsening conditions such as depression, anxiety, and chronic fatigue.”
In the US, large-scale commercial bakeries commonly rely on flour treated with agents such as benzoyl peroxide or chlorine gas. These bleaching steps are typically used to strip the flour of its naturally yellow pigments (xanthophyll) and to speed up the “aging” process that makes dough behave more predictably.
By accelerating gluten development, manufacturers can produce bread with a softer bite and a consistently bright white interior — traits often prioritized in mass-produced loaves. In Europe, this type of bleaching process is banned.
The National Institute of Health also notes that many popular American white breads fall into the category of ultra-processed foods.
Beyond removing the bran and germ (the most nutrient-dense parts of the grain), producers may add ingredients such as high fructose corn syrup, extra salt, and dough conditioners to improve texture and extend shelf life.