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dietary + noun
常用作定语修饰名词，表示与饮食相关的。
She has strict dietary restrictions.
她有严格的饮食限制。
饮食的
先理解核心含义，再看它在真实句子里的用法。
饮食的
of or relating to the diet
She has strict dietary restrictions.
她有严格的饮食限制。
与规定饮食有关的；通常指与人或动物的饮食有关的
Pertaining to a prescribed diet; (generally), relating to what a person or animal eats.
构成食物来源的
Comprising a food source.
She has specific dietary restrictions due to her allergy.
由于过敏，她有特定的饮食限制。
The doctor gave me some dietary advice to lower my cholesterol.
医生给我一些降低胆固醇的饮食建议。
It is important to monitor your dietary intake of sodium.
监控钠的饮食摄入很重要。
常用作定语修饰名词，表示与饮食相关的。
She has strict dietary restrictions.
她有严格的饮食限制。
可后接介词短语进一步说明饮食的适用范围。
The doctor provided dietary guidelines for diabetes.
医生提供了针对糖尿病的饮食指南。
dietary 作名词时较少用，通常指规定的饮食方案。
The patient was put on a dietary of low sodium.
病人被规定了低钠饮食。
Not this
I dietary to lose weight.
Use this
I diet to lose weight.
"dietary"只能作形容词或名词，不能作动词；表示"节食"应该用动词"diet"。
Not this
I need to change my dietary.
Use this
I need to change my diet.
"dietary"作为名词通常指规定的饮食（如特殊饮食），泛指日常饮食用"diet"。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
饮食习惯
Changing dietary habits can improve overall health.
改变饮食习惯可以改善整体健康。
膳食补充剂
Many people take dietary supplements to ensure adequate nutrition.
许多人服用膳食补充剂以确保充足的营养。
饮食需求
The menu accommodates various dietary requirements.
菜单满足各种饮食需求。
饮食限制
Please inform us of any dietary restrictions before the event.
请在活动前告知我们任何饮食限制。
膳食纤维
Fruits and vegetables are rich in dietary fiber.
水果和蔬菜富含膳食纤维。
饮食摄入
Monitoring dietary intake helps maintain a balanced diet.
监测饮食摄入有助于保持均衡饮食。
Use dietary naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想“diet”（节食）加“ary”后缀，就是“饮食的”；想象你在节食，必须遵守严格的饮食规定。
该形容词通常出现在健康、营养和食品相关的正式或半正式语境中，如膳食指南、医学文献和食品标签，语气中性。
As an adjective, it is typically used attributively before a noun. As a noun, it is countable.
Dictionary facts from ECDICT, WIKTIONARY.