What is glycation and how does sugar damage your cells from the inside?
Sugar damages your cells through a chain of chemical reactions that affect proteins, power plants, and small blood vessels. The mechanism is well described and provides a concrete reason to take persistently high blood sugar seriously.
Glycation is a chemical reaction in which sugar molecules spontaneously attach to proteins, without the body having any control over the process. Through a series of steps, waste products called AGEs are formed. These accumulate in tissues as you age, and do so more rapidly when blood sugar remains persistently elevated.
AGEs disrupt cell function by chemically altering intracellular molecules. They have been linked to age-related diseases such as diabetes, cardiovascular disease, kidney disease, and Alzheimer's disease. In the skin, glycation primarily affects collagen, the protein that keeps skin firm and elastic. The result: wrinkles, loss of elasticity, and a yellowish complexion. UV radiation accelerates this process further.
A large part of the damage is driven by harmful oxygen radicals (free radicals). Chronically high blood sugar activates several metabolic pathways that produce an excess of these radicals. At the same time, high blood sugar suppresses the cell's own defence systems that normally clear those radicals away. The consequence: the cell's power plants become damaged, cells die off more rapidly, and cell membranes are compromised.
AGEs also bind to a specific receptor on the cell surface known as the RAGE receptor. This binding activates inflammatory pathways and damages the walls of small blood vessels, particularly in the eyes, kidneys, and nerves. The same processes, oxidative stress, mitochondrial damage, and inflammation, are also found in the brains of people with Alzheimer's disease. There are indications that AGEs form a bridge between diabetes and that brain condition, although the evidence for this is not yet conclusive.
The RAGE receptor does more than process AGEs, incidentally. Following a heart attack, a protein released during cell damage has been shown to activate the same receptor and cause additional heart damage. This makes RAGE a broader alarm receptor in multiple disease processes, not exclusively in sugar-related damage.
All claims are based on published research (PMID 36364850, 27156888, 33248932, 40048937, 28137665, 39411860). The core of glycation and AGE-related damage is well substantiated; the link with Alzheimer's disease is plausible but has not yet been definitively proven.
How does air pollution damage your cells from the inside?
Air pollution damages your cells from the inside through oxidative stress: fine particulate matter causes an excess of harmful oxygen molecules that attack your DNA, energy factories, and immune system. Protection begins with limiting exposure, because the damage occurs at the cellular level.
Why are cells damaged when you don't get enough oxygen?
Oxygen deprivation damages cells through a chain of mechanisms: energy deficit, overstimulation of nerve cells, and an assault by free radicals, partly triggered precisely when blood flow is restored. How severe the damage turns out to be depends on how long and how serious the deficit is.
What are senescent cells and why are they bad for you?
Senescent cells are damaged cells that stop dividing but continue to live and chronically inflame their surroundings. They accumulate as you age and are strongly linked to age-related diseases, but because they also play a protective role, simply clearing them all away is not an option.
Can eating too little actually damage your cells?
Eating moderately less does not damage your cells - it actually protects them through a cellular clean-up mechanism. However, eating severely too little for a prolonged period can cause that same clean-up mechanism to overshoot and actually kill cells, so the line is drawn at extreme restriction.
Why do cells lose their ability to repair themselves over time?
Cells lose their repair capacity through a combination of declining energy stores, impaired DNA repair and the accumulation of 'burned-out' cells that secrete inflammatory substances. These are well-supported mechanisms, although it is still too early to act on them through supplements or therapies.
Does caloric restriction actually make your cells younger?
Caloric restriction slows ageing processes in cells, but whether your cells actually become younger as a result has not yet been proven in humans. The metabolic benefits, such as improved insulin sensitivity, have been demonstrated in human studies.