Butter has 102 calories per serving (1 tbsp (14g)).
Butter is pure fat, calorically speaking. One tablespoon is 102 cal. On toast, in cooking, melted on vegetables — it adds up. Not evil, just calorie-dense. Know what a tablespoon looks like and you're fine.
Calorie-wise they're nearly identical (~100-120 cal per tbsp). Olive oil has a healthier fat profile. For weight loss specifically, the amount matters more than the type. Measure either one.
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