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VegEco

Food & Nutrition

Soy milk vs almond milk

Soy and almond are the two plant milks most often recommended by dietitians and most often argued about online. They behave very differently: one is a complete protein source, the other is a light, low-calorie drink. This page separates the nutrition question from the sustainability question so you can pick per use case rather than picking a side.

Side by side

Protein

Soy milk

Comparable to cow's milk and a complete protein — the usual dietitian default for children and older adults.

Almond milk

Very low; almond milk is mostly water with a small amount of ground almond.

Calories

Soy milk

Moderate.

Almond milk

Low, which makes unsweetened almond popular for calorie control.

Water use

Soy milk

Modest freshwater demand.

Almond milk

The highest freshwater demand of the mainstream plant milks, concentrated in drought-exposed growing regions.

Allergens

Soy milk

Soy is a major allergen and a common early-childhood allergy.

Almond milk

Tree-nut allergen; unsuitable for many school and workplace settings.

Cooking

Soy milk

Sets in custards and béchamel and curdles less in hot savoury dishes.

Almond milk

Thin; better in cereal, smoothies and baking than in sauces.

Questions people ask

Does soy milk affect hormones?
Human trials have not found that ordinary dietary soy intake changes testosterone or oestrogen in a clinically meaningful way. Major dietetic bodies treat soy foods as safe for all age groups.
Which plant milk has the most protein?
Soy and pea drinks lead by a wide margin. Almond, rice and oat are all low-protein unless the manufacturer has blended in a protein isolate.

Our reporting on this

Related desks

More comparisons

Plant-Based

Terms defined

How we define these terms →
Plant-based diet
A dietary pattern centered on foods from plants — vegetables, fruits, whole grains, legumes, nuts and seeds — with animal products reduced or excluded.
Vegan
A way of living that seeks to exclude, as far as possible, all forms of exploitation of animals — including in food, clothing and other uses.
Vegetarian
A diet that excludes meat, poultry and fish but may include dairy and eggs (lacto-ovo).
Flexitarian
A mostly plant-based eating pattern that occasionally includes meat or fish.

This comparison weighs two options against the same criteria so the trade-off is visible instead of implied. We do not crown a universal winner: the better choice depends on what you are optimising for — emissions, animal welfare, nutrition, cost, availability or time — and those priorities differ legitimately between readers.

Everything below is drawn from our own reporting in this edition. Where the evidence is genuinely contested, the comparison says so rather than resolving it artificially, and the linked articles show the datasets behind each claim.

How we compare

Both sides are measured against identical criteria and, wherever possible, against figures from the same study or dataset — mixing sources with different system boundaries is the most common way comparisons mislead. Emissions are given per useful unit rather than per kilogram where that changes the ranking, welfare is assessed against the certification scheme actually in force, and nutrition is compared at realistic serving sizes.

What the comparison cannot settle

Local context decides several criteria. Water footprint depends on where a crop grows, not only on what it is. Availability, price and labelling rules vary by country. Personal nutrition needs vary by age, pregnancy, medication and medical history. Treat the comparison as a structured way to think, and check the criteria that are local to you.

Making the decision

Pick the two or three criteria that actually matter to you and ignore the rest — a comparison optimised for everything at once is optimised for nothing. If the two options are close on your priorities, the tiebreaker is usually whichever you will realistically keep doing, because sustained changes outperform theoretically optimal ones that get abandoned.

The criteria this comparison applies to both sides

  • Climate

    What we look at
    Emissions per useful unit
    Why it varies
    System boundaries and geography

  • Land and water

    What we look at
    Use per unit of output
    Why it varies
    Local rainfall and land quality

  • Animals

    What we look at
    Welfare outcomes, not labels
    Why it varies
    Certification scheme in force

  • Nutrition

    What we look at
    Realistic serving sizes
    Why it varies
    Individual needs and intake

  • Practicality

    What we look at
    Cost, availability, effort
    Why it varies
    Country and household

Questions people ask

Why is there no overall winner?
Because the criteria trade off against each other. An option that wins on emissions may lose on cost or availability, so a single ranking would hide the decision you are actually making. The comparison shows each criterion separately instead.
Are the figures the same everywhere?
No. Water use, emissions intensity, price and labelling rules all vary by country and by year. We give the region and date for every figure so you can judge whether it applies where you live.
Is this comparison sponsored?
No. VegEco accepts no payment for coverage and no brand placements. Comparisons are brand-neutral and explain what you can verify yourself on a label or in a public dataset.
Should I use this for medical decisions?
No. Nutrition sections describe general evidence, not individual advice. If you are pregnant, managing a condition or taking medication, discuss dietary changes with a qualified clinician.