How to improve digestion: causes of poor digestion and what to do

How good digestion works

Digesting is turning food into nutrients the body can absorb, and it is a more complex and orderly process than it seems. It starts in the mouth, where chewing grinds the food and saliva begins digestion — which is why eating quickly and chewing little already loads work onto the rest of the system. It continues in the stomach, where acids and enzymes break the food down, and goes on in the gut, where most nutrients are absorbed and where your microbiome lives, fermenting what has not been absorbed before. This whole journey is coordinated by the nervous system, including the gut's own "brain", which explains why stress can throw the entire process off. Good digestion is not "not noticing anything", but that machinery working smoothly: when it jams somewhere, heaviness, gas or bloating appear.

Why you have poor digestion

Most poor digestion does not come from a disease, but from a combination of very correctable habits and factors:

• Eating quickly and swallowing air, without chewing well.
• Very heavy, very fatty or very late meals before sleep.
• Little fibre, or raising it suddenly (it ferments and causes gas).
• Little hydration, which slows transit.
• A sedentary life: movement helps move the food along, and lack of it holds it back.
• Chronic stress, which alters the gut's motility and sensitivity.

The habits that really help

Improving digestion is less spectacular than the advertising for teas and "digestives" promises, but much more effective. The pillars with evidence behind them are few and simple: eating slowly and chewing well, so as not to overload the stomach or swallow air; raising fibre gradually and with enough water, to regulate transit without triggering gas; moving daily, and especially taking a walk after meals, which helps move the food along; and managing stress, because the gut responds immediately to how you feel. None of these habits is glamorous or sold in a pot, but together they solve the vast majority of everyday poor digestion. The key, as always, is consistency rather than perfection.

Stress and the gut: more connected than you think

If there is one undervalued factor in digestion, it is stress. The gut has its own network of neurons and is in constant communication with the brain through the gut-brain axis; that is why emotional states translate into digestive sensations almost instantly. The stomach shut down by upset, the diarrhoea before an exam, the knot in the gut from nerves: these are not "things in the head", they are the gut's real response to the brain's signals. This has a very powerful practical consequence: you can improve your digestion by working on stress — with breathing, quality sleep, exercise, time in nature — just as by working on food. In many people with chronic difficult digestion, the stress component weighs as much as the dietary one.

Identifying your trigger foods

Not everyone digests the same, and the same food can sit wonderfully with one person and terribly with another. The usual suspects of poor digestion are legumes (because of their fermentation), dairy if there is lactose intolerance, cruciferous vegetables (cabbage, broccoli, cauliflower), excess fat and fried food, alcohol, coffee and spice in sensitive people, and polyol sweeteners. The temptation is to cut all these groups "just in case", but that impoverishes the diet needlessly. The sensible strategy is the reverse: identify which affect YOU through observation, and adjust only those. A simple record of what you eat and how you feel afterwards is the best tool to separate your real triggers from the imaginary ones — and that is where a visual tracking app saves a lot of work.

When poor digestion deserves a consultation

The vast majority of poor digestion is annoying but benign, and improves with the habits in this guide. However, there are situations where it is worth not settling for "it must be something I ate" and consulting a doctor. The warning signs are: intense abdominal pain or pain that does not ease, unintentional weight loss, blood in the stool or black stools, repeated vomiting, difficulty or pain swallowing, and a new and persistent change in bowel habits. Frequent heartburn or reflux also deserves attention, as it may indicate gastritis or reflux, or the suspicion of an intolerance if symptoms appear consistently after a specific food. Consulting in time is not alarmism: it is ruling out the uncommon so you can calmly treat the usual.

Improving digestion starts with understanding what sits well with you and what does not, and there Renzy saves you the diary by hand. By photographing your meals you keep a visual record you can cross-reference with how you feel afterwards, to spot your real trigger foods, see whether you eat enough fibre and variety, and notice patterns — that heaviness from big dinners, that bloating after a certain dish — that slip by the naked eye. With that mirror in front of you, adjustments stop being blind trial and error and become concrete changes on concrete data. Because to digest better, almost always, the first step is to know yourself.