Tired, Foggy or Craving Sugar? 7 Signs You Need More Water
Have you ever reached for a coffee or something sweet at 3pm, only to realise you'd barely had a glass of water all day?
I see this all the time with the women I work with. We put so much attention on what we eat, our hormones and our sleep, and we forget one of the simplest things our body needs to feel good: water.
Even mild dehydration can affect your energy, focus and mood. And the tricky part is that the signs are easy to blame on something else.
How much water do you actually need?
In New Zealand, the recommended adequate intake for women is around 2.8 litres of total water a day, and about 3.4 litres for men. That includes everything: water, herbal tea, milk and the water in your food. Food usually provides around 20% of it, so for most women that means roughly 2 litres from drinks.
You'll need more if it's hot, if you exercise, or if you're having hot flushes or night sweats.
A simple check: your urine should be a pale straw colour most of the day.
7 signs you may need more water
1. Headaches. A dull headache that appears in the afternoon is one of the most common signs. Before reaching for a painkiller, try a big glass of water and give it 20–30 minutes.
2. Fatigue and the afternoon slump. Low fluid intake can leave you feeling flat and sluggish. Many women mistake this for needing sugar or more caffeine.
3. Brain fog and poor concentration. Studies show that even mild dehydration can affect focus, memory and alertness. If you're already dealing with perimenopause brain fog, this can make it worse.
4. Low mood or irritability. Feeling more anxious, tense or short-tempered than usual? Hydration plays a role in how you feel, not just how you function.
5. Constipation. Your gut needs water to keep things moving, especially when you're increasing fibre. More veggies with too little water can actually leave you more bloated.
6. Dry skin and lips. Your skin reflects what's happening inside. Hydration alone won't fix dry skin, but it's a good place to start.
7. Feeling dizzy when you stand up. Lower fluid levels can reduce blood pressure, which can leave you light-headed. If this happens often, talk to your doctor.
Why it matters more in your 40s and beyond
As we get older, our thirst signal becomes less reliable, so we can be low on fluids without feeling thirsty. Hot flushes and night sweats during perimenopause also increase fluid loss. And many of us run on coffee in the morning and a glass of wine at night, which doesn't help.
Easy ways to drink more
The best approach is the one you'll actually stick to. Try attaching water to habits you already have:
Wake up → a glass of water before your coffee or tea
Every meal → a glass of water on the table
Desk or car → keep a bottle you like within reach
Afternoon slump → water or herbal tea first, then decide if you still want a snack
After exercise → refill straight away
If plain water bores you, add lemon, cucumber, mint or frozen berries. Water-rich foods like cucumber, watermelon, oranges, soups and yoghurt count too.
The bottom line
Hydration won't fix everything, but it's one of the easiest wins for your energy, focus and mood. Start with one new water habit this week and notice how you feel.
Feeling tired all the time and not sure why?
Fatigue, brain fog and cravings can have many causes, from blood sugar and sleep to hormonal changes. If you want help figuring out what's going on for you, book your free initial assessment.
This article is for educational purposes and is not a substitute for medical advice. If you have frequent dizziness, a heart or kidney condition, or have been told to limit fluids, please follow your doctor's advice.
