Magnesium Rich Foods: What to Eat and How Much You Actually Need

Magnesium is involved in more than 300 enzyme reactions in the body, including muscle contraction, nerve signalling, blood sugar regulation and bone formation. It is also one of the minerals people most commonly fall short on, largely because the richest sources are foods that modern diets have quietly dropped.

How much you need

Recommended daily intake for adults is approximately 400 to 420 mg for men and 310 to 320 mg for women. Requirements rise during pregnancy, to around 350 to 360 mg.

The best food sources

Food	Serving	Magnesium (approx.)
Pumpkin seeds	30 g	156 mg
Chia seeds	30 g	111 mg
Almonds	30 g	80 mg
Spinach, cooked	1 cup	78 mg
Cashews	30 g	74 mg
Black beans, cooked	1 cup	60 mg
Dark chocolate, 70 percent plus	30 g	50 mg
Edamame, cooked	half cup	50 mg
Peanut butter	2 tbsp	49 mg
Brown rice, cooked	1 cup	42 mg
Avocado	1 medium	44 mg
Banana	1 medium	32 mg
Salmon	85 g	26 mg

Pumpkin seeds are far ahead of everything else. A single 30 gram handful covers roughly 40 percent of a woman's daily requirement, which no other common food matches per serving.

Why intake is often low

•     Refining removes it. White flour and white rice lose most of their magnesium during processing

•     Seeds, nuts and legumes are the richest sources, and these are exactly the foods many diets are lightest on

•     Leafy greens are strong sources and average vegetable intake is below recommendations in most countries

•     Ultra processed foods are poor sources, so a diet built around them runs low almost automatically.

Signs of low magnesium

Mild shortfall often produces no clear symptoms. When symptoms do appear they are non specific, which means they point to many possible causes and cannot be self diagnosed.

•     Muscle cramps or twitching

•     Fatigue and weakness

•     Poor sleep quality

•     Loss of appetite

•     Nausea

•     Irregular heartbeat in more significant deficiency

Risk is higher with type 2 diabetes, digestive conditions such as Crohn's or coeliac disease, long term use of certain diuretics and proton pump inhibitors, chronic heavy alcohol use, and older age, since absorption declines. A blood test is the only way to establish a deficiency, and even that is imperfect since most magnesium sits in bone and tissue rather than blood.

Getting more from food

1.   Keep pumpkin seeds within reach. Scattered on salads, porridge or yoghurt they are the easiest single upgrade

2.   Switch to whole grains where you can, since refining is what strips the mineral out

3.   Add a portion of legumes several times a week

4.   Eat leafy greens regularly, cooked as well as raw, since cooking shrinks the volume and raises the amount per serving

5.   A square of dark chocolate is a genuine source, not just a justification

On supplements

Food first is the sensible default, because food sources come with fiber, potassium and other nutrients that supplements do not. If a supplement is warranted, that is a decision to make with a doctor, particularly if you have kidney disease or take regular medication, since magnesium can interact with several drug classes. High doses commonly cause diarrhoea and can cause more serious effects when kidney function is impaired.

Frequently asked questions

Does magnesium help with sleep? Evidence is mixed and mostly limited to people who are deficient. It is not established as a general sleep aid.

Does magnesium stop leg cramps? Trials have been largely disappointing, especially for night cramps in older adults and during pregnancy.

Which food is highest in magnesium? Pumpkin seeds, by a wide margin per serving.

Can you get too much from food? No. Excess dietary magnesium is excreted by healthy kidneys. Excess from supplements is a different matter.

This article is general information, not medical advice. Speak to a qualified healthcare professional before starting any supplement, particularly if you have kidney disease or take regular medication.