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.
Eating moderately less does not damage cells - it actually protects them. Fasting and caloric restriction stimulate autophagy, the system by which cells clear out damaged components and proteins. Without that clean-up cycle, cellular waste products accumulate, contributing to ageing and disease. If you artificially block autophagy, the protective effects of eating less largely disappear.
But there is a downside at extremes. When you eat far too little for a prolonged period, autophagy can tip into overdrive. Cells then consume themselves to the point of dying - a harmful form of cell death. This is not a theoretical risk: research shows that with sustained, severe caloric restriction this mechanism becomes active. The difference lies in the dose: moderate, temporary caloric restriction is one thing; chronic starvation is another.
At the molecular level, caloric restriction specifically slows the ageing of mitochondria (the energy factories in your cells) and of metabolic processes. Not all forms of cellular ageing are addressed, however. Changes that are unrelated to energy and metabolism largely remain unaffected.
For the brain, a separate nuance applies. Eating less can reduce harmful oxygen radicals that damage cells and brain cells. Yet prolonged exercise appears more effective than caloric restriction when it comes specifically to the brain.
Based on multiple studies of varying maturity: from broad transcriptome analyses to mechanistic research. The evidence for moderate autophagy stimulation with caloric restriction is robust; the evidence for autophagic cell death under extreme restriction is more limited and rests on fewer studies.
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.
Does dehydration make your cells age faster?
There are biologically plausible indications that dehydration harms cells, but whether simply not drinking enough accelerates ageing in healthy people has not yet been demonstrated. Drinking enough remains sensible, though it cannot yet be marketed as an anti-ageing tip.
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.
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.
Can you protect your DNA from damage through diet?
Diet can both protect and damage your DNA, but the protective effects of supplements often fall short in practice. Make sure you are not deficient in zinc, folate and selenium, eat plenty of vegetables and fruit, and avoid supplements containing high doses of beta-carotene, especially if you smoke.
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.