Food, drinks & mood

Your gut is lined with about 100 million nerve cells. Harvard Health notes that about 95% of your serotonin, a chemical messenger linked to mood, is made in your digestive tract.

This is part of why stress can give you “butterflies” or an upset stomach, and why eating regularly can help you feel steadier. Scientists are still learning exactly how this connection works.

Early signs can be easy to miss: a dull headache, low patience, trouble focusing, feeling shaky or tearful. Before you decide a day is going badly, it can help to ask, “When did I last eat or drink?”

There are no “good” or “bad” foods in this guide, no diets and nothing to buy. The goal is simply not running on empty.

Common signs (NHS)

• Dark yellow, strong-smelling pee
• Dry mouth, lips and tongue
• Feeling dizzy
• Feeling thirsty
• Feeling tired
• Headache or feeling light-headed
• Peeing less often than usual
• Sunken eyes

You are more likely to get dehydrated if you have diarrhea or are being sick, have been in the sun or heat for a long time, have a high temperature, have sweated a lot from exercise, or have drunk too much alcohol. Babies, children and older adults are at higher risk.

A major review of the research found that even mild dehydration can affect mood, alertness and concentration in some studies. The most consistent finding was a change in mood: people felt worse when they were short of water.

The results for thinking and memory were mixed. Many studies combined dehydration with heat and hard exercise, so it is hard to know which caused what. Drinking water reliably made people feel more alert, even when test scores did not change much.

Your body needs more fluid when you are

• Having diarrhea or vomiting
• Ill or recovering from illness
• In hot weather or a hot place
• More physically active, or sweating a lot
• Pregnant or breastfeeding
• Running a fever

If you have a heart, kidney or other health condition, your provider may give you a different amount to aim for. Follow their advice over general tips. If you are unsure, consult with your clinical provider.

Ideas from the CDC and NHS

• Add a slice of lemon or lime for flavor
• Carry a reusable water bottle
• Choose water over sugary drinks
• Freeze a bottle overnight for cold water all day
• Have a glass with each meal
• Keep fruit juice and smoothies to one small glass (150 ml) a day, with a meal

Habit tricks

• Herbal tea or sparkling water count if plain water feels boring
• Keep a full glass by your bed or desk
• Pair it with something you already do: a glass after brushing your teeth, one when you sit down to work
• Use a bottle with time markings if you like visual goals

Research shows older people feel less thirsty and may not drink enough to replace what they have lost, even after going without water. Their kidneys also become less able to hold on to water.

That is why experts suggest older adults drink regularly through the day, even when not thirsty. Dehydration in older adults can show up as tiredness, dizziness or confusion, which can be mistaken for other problems.

Eating something every few hours helps many people feel more even through the day. NIMH lists eating regular, healthy meals as one way to care for your mental health.

Ways to keep a rhythm

• If mornings are hard, start with something small, like toast, fruit or yogurt
• Keep easy snacks in your bag, car or desk
• Plan rough times for meals, like breakfast, lunch and dinner, with snacks if you get hungry between
• Set a gentle phone reminder if you forget to eat when busy or stressed

General NHS guidance suggests building meals around starchy foods like bread, rice, potatoes or pasta (wholegrain when you can), and having at least 5 portions of fruit and vegetables a day. Fresh, frozen, canned and dried all count.

Wholegrain and higher-fiber foods can help you feel full for longer, which can mean fewer energy dips.

Simple ways to add variety

• Add a piece of fruit to breakfast
• Have something with protein, like eggs, beans, lentils, fish, chicken, tofu or nuts, at meals
• Throw a handful of frozen vegetables into pasta, soup or rice
• Try one new food a week, just for curiosity

On days when cooking feels impossible, no-prep food keeps you going. Frozen vegetables count toward your 5 a day just like fresh ones, and canned and dried fruit count too.

A low-day stash

• Bread, crackers or cereal
• Canned soup, beans or fish
• Frozen meals and frozen vegetables
• Fruit that keeps, like apples or bananas
• Yogurt, milk or cheese

Caring for your body is never about shrinking, punishing or controlling it. This guide doesn’t count calories, weigh food or label foods as clean or junk.

Signs food may be becoming a struggle

• Feeling you must “earn” food or make up for it
• Food or body thoughts taking up much of your day
• Lots of rigid rules about what, when or how much you can eat
• Skipping meals to feel in control
• Strong guilt or shame after eating

The FDA lists

• Anxiety and jitters
• Faster heart rate or heart palpitations
• Headache
• Higher blood pressure
• Trouble sleeping
• Upset stomach or nausea

If you live with anxiety or panic, it can be worth noticing whether caffeine makes your body feel “on edge.” NIMH notes that for some people, cutting back on caffeine can help.

Amounts vary a lot. The FDA says a 12-ounce cup of brewed coffee can contain about 113 to 247 milligrams of caffeine. Energy drinks can have 41 to 246 milligrams per 12 ounces.

Places to check

• Black and green tea
• Chocolate and some pre-workout products
• Coffee and espresso drinks
• Colas and some other sodas
• Energy drinks and “energy shots”

The FDA warns that pure and highly concentrated caffeine products can have serious health effects, including death. Taking in around 1,200 milligrams quickly, less than half a teaspoon of pure caffeine, can cause seizures.

If you have caffeine every day, stopping suddenly can bring on withdrawal. It isn’t dangerous, but it can be unpleasant. The FDA suggests cutting back gradually.

A gentle plan

1. Notice how much you have now for a few days
2. Swap one drink a day for water, decaf or herbal tea
3. Move your last caffeinated drink earlier in the day
4. After a week, swap one more if you want to
5. Notice changes in sleep, jitters and mood

People who are pregnant, trying to become pregnant or breastfeeding should ask their provider whether to limit caffeine.

If you have a heart condition, high blood pressure or another health concern, consult with your clinical provider about what is right for you.

The CDC shares the U.S. Dietary Guidelines advice that adults of legal drinking age can choose not to drink, or to drink in moderation: two drinks or less in a day for men, and one drink or less in a day for women.

The CDC says some people should not drink at all, including

• Anyone under 21
• People recovering from an alcohol use disorder, or who can’t control how much they drink
• People who are pregnant or might be
• People with certain health conditions (ask your provider)

When alcohol becomes the main way to calm down, a loop can form. You feel tense, you drink, you feel better for a while, then the mood dips and anxiety rises, so you reach for another drink.

Questions to ask yourself

• Do I drink mainly to escape feelings?
• Do I feel more anxious the day after drinking?
• Have people close to me mentioned it?
• Is drinking affecting my sleep, work or relationships?

Older people are more sensitive to the sleepy effects of alcohol, which raises the risk of falls and injuries. Big life changes, like retirement or losing a loved one, can lead some people to drink more.

American Academy of Pediatrics estimates

• Ages 1–3: about 4 cups of fluids a day, including water or milk
• Ages 4–8: about 5 cups a day
• Older children: about 7–8 cups a day

These amounts vary and need adjusting for activity, heat and humidity. Children may not notice they need fluids, so experts suggest encouraging drinks before they feel thirsty.

Ideas from the AAP

• Add berries, cucumber or mint for flavour
• Drink water yourself so they see you do it
• Freeze fruit into ice cubes together
• Let kids choose a fun cup or bottle
• Pack water bottles before going out

Energy drinks can contain a lot of caffeine and sugar, and medical experts advise against them for children and teens. Too much caffeine can cause a racing heart, anxiety, sleep problems and dehydration.

Teens often use them to push through tiredness. It is worth talking about the tiredness itself: late nights, stress or too many commitments.

Ideas

• Avoid calling foods “good” or “bad”
• Avoid commenting on bodies or weight, including your own
• Eat meals together when you can
• Let kids help choose and cook meals
• Offer regular meals and snacks so no one gets too hungry

If you are worried about a child’s eating, weight or body image, see the Eating disorders guide and talk to their provider.

A long gap between lunch and dinner is a common time for meltdowns. A snack after school and a full water bottle in the bag can make homework and evenings calmer.

Food is how many families and cultures show love, celebrate and grieve. Sharing a meal gives you a natural reason to slow down, talk and feel part of something.

Ideas

• Batch-cook with a friend and swap portions
• Cook a family recipe and share the story behind it
• Eat together at a table when you can, phones away
• Join a community meal, potluck or faith gathering

Places that may help

• Community and faith meals
• Food banks and community pantries
• School meal programs
• Senior centers that serve shared meals

Using these services is not something to be ashamed of. They exist for times exactly like this.

Frozen, canned and dried fruit and vegetables all count toward your 5 a day and often cost less than fresh. Starchy foods like rice, pasta, potatoes and bread are filling and affordable.

Ideas

• Beans and lentils for cheap protein
• Cook once, eat twice
• Plan a few simple meals before shopping
• Store brands are usually cheaper

Ideas

• Drop off easy meals or groceries
• Eat with them, even just a snack
• Fill a water bottle and leave it by them
• Offer choices: “Would you rather have soup or toast?”

Avoid

• “Just drink more water and you’ll feel better”
• “You need to eat healthier”
• Comments about weight or body size
• Comments about how much they ate

Even if said with love, these can make someone withdraw further.

Talk when they are sober and you are calm. Say what you have noticed and how you feel, rather than labelling them. “I’ve noticed you’re drinking more since the move, and I’m worried about you.”