Chia Seeds vs Flax Seeds: which is healthier?

Per 100g, Chia Seeds have 483 calories, 16.5g protein, 34.4g fiber, and 30.7g fat, while Flax Seeds have 550 calories, 18.3g protein, 27.3g fiber, and 42.2g fat. Chia Seeds are the lighter choice, while Flax Seeds deliver more protein, so the better pick depends on whether you are cutting calories or chasing protein targets.

Which has more calories, Chia Seeds or Flax Seeds?

Per 100g, Chia Seeds have 483 calories and Flax Seeds have 550 calories, a difference of 67 calories. In practical terms, 1 tablespoon (58 calories) of chia seeds compares with 1 tbsp (10g) (55 calories) of flax seeds.

Which has more protein, Chia Seeds or Flax Seeds?

Flax Seeds lead on protein with 18.3g per 100g; the gap is 1.8g per 100g (Chia Seeds 16.5g vs Flax Seeds 18.3g). If you are tracking protein targets, that difference compounds quickly across a full day of meals.

Which is better for a low-carb diet, Chia Seeds or Flax Seeds?

Flax Seeds have 28.9g of carbs per 100g compared to 42.1g in Chia Seeds, making Flax Seeds the easier fit for low-carb or keto plans. Fiber is 34.4g vs 27.3g per 100g, which also affects net carbs.

Can I substitute Chia Seeds for Flax Seeds?

Often, yes. Swapping flax seeds for chia seeds shifts your meal by about 67 calories and 1.8g of protein per 100g, so adjust portions if you are logging macros. Texture and cooking behavior differ more than nutrition in many recipes, so test the swap in small batches first.

Chia Seeds

Flax Seeds

All Comparisons

Chia Seeds vs Flax Seeds

Chia Seeds

Wins in 5 of 6 categories

Compare Chia Seeds and Flax Seeds calories, protein, and nutrition. See which fits your diet goals.

Verdict (USDA data)

Per 100g, Chia Seeds has 483 calories vs Flax Seeds's 550. Chia Seeds has more fiber (34.4g vs 27.3g); Flax Seeds has more protein (18.3g vs 16.5g).

Sources: Chia Seeds (FDC 170554) · Flax Seeds (FDC 2707588)

Nutrition Comparison (per 100g)

Nutrient	Chia Seeds		Flax Seeds
Calories	483	vs	550
Protein	16.5g	vs	18.3g
Carbs	42.1g	vs	28.9g
Fat	30.7g	vs	42.2g
Fiber	34.4g	vs	27.3g
Sodium	16mg	vs	30mg

Winner determined by: fewer calories, more protein, more fiber, less fat, less sodium

Source: USDA FoodData Central. Chia Seeds: FDC 170554 · Flax Seeds: FDC 2707588.

When to Choose Each

Choose Chia Seeds when:

You're cutting calories (483 vs 550 per 100g)
You want more fiber (34.4g vs 27.3g per 100g)

See full Chia Seeds nutrition

Choose Flax Seeds when:

You need more protein (18.3g vs 16.5g per 100g)
A typical portion is 1 tbsp (10g) (55 calories)

See full Flax Seeds nutrition

Frequently Asked Questions

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Last updated: 2026-06-10

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