血糖生成指数（GI）和血糖负荷（GL）有什么区别？
What's the difference between glycaemic index and glycaemic load?
GI衡量含等量可吸收碳水的食物使血糖升高的相对速度，但没有考虑实际吃了多少。GL把份量算进来：GL等于GI乘以该份食物的碳水克数再除以100。西瓜GI较高但每份碳水不多，GL并不高，这说明只看GI可能误判。烹调方式、成熟度和搭配的蛋白质脂肪也会改变实际血糖反应。
GI ranks how fast foods containing equal amounts of available carbohydrate raise blood glucose, but ignores how much you actually eat. GL adds portion size: GL equals GI times grams of carbohydrate per serving divided by 100. Watermelon has a high GI but little carbohydrate per serving, so its GL is low — showing GI alone can mislead. Cooking method, ripeness and accompanying protein and fat also shift the real response.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
《默克家庭医学手册》Merck Manual Home Health Handbook 中译版,人民卫生出版社
The Merck Manual Home Health Handbook, Chinese ed., PMPH
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787117181631（按标识回读: 默克家庭医学手册）
#GI #血糖负荷
蛋白质吃多少、什么时候吃更有利于增肌？
How much protein, and when, best supports muscle gain?
多数研究支持规律力量训练者每日每公斤体重约1.4—2.0克蛋白质，分3—5餐、每餐20—40克可较好地反复刺激肌肉蛋白合成。所谓"训练后30分钟窗口"没有早期认为的那么关键，全天总量与分布更重要。肾功能异常者摄入量应遵医嘱。
Most evidence supports about 1.4–2.0 g of protein per kg body weight daily for people doing regular resistance training, spread over three to five meals with 20–40 g each to repeatedly stimulate muscle protein synthesis. The supposed 30-minute post-workout window matters less than once believed; total daily intake and distribution matter more. People with impaired kidney function should follow medical advice on intake.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
《默克家庭医学手册》Merck Manual Home Health Handbook 中译版,人民卫生出版社
The Merck Manual Home Health Handbook, Chinese ed., PMPH
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787117181631（按标识回读: 默克家庭医学手册）
#蛋白质 #增肌 #摄入时机
膳食纤维是怎么通过肠道菌群影响健康的？
How does dietary fibre act through gut microbes to affect health?
人体缺少分解大部分纤维的酶，这些纤维进入结肠后被细菌发酵，产生丁酸、丙酸、乙酸等短链脂肪酸。丁酸是结肠上皮细胞的重要能量来源并有抗炎作用；短链脂肪酸还参与调节食欲激素与胰岛素敏感性。纤维摄入不足时，部分细菌会转而分解肠道黏液层，可能削弱屏障功能。
Humans lack enzymes for most fibre, so it reaches the colon where bacteria ferment it into short-chain fatty acids such as butyrate, propionate and acetate. Butyrate is a key fuel for colon lining cells and has anti-inflammatory effects, while short-chain fatty acids also influence appetite hormones and insulin sensitivity. When fibre is scarce, some bacteria switch to degrading the gut mucus layer, which may weaken barrier function.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
《默克家庭医学手册》Merck Manual Home Health Handbook 中译版,人民卫生出版社
The Merck Manual Home Health Handbook, Chinese ed., PMPH
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787117181631（按标识回读: 默克家庭医学手册）
#膳食纤维 #短链脂肪酸 #肠道菌群
高强度间歇训练比匀速有氧更好吗？
Is high-intensity interval training better than steady-state cardio?
在提升最大摄氧量方面，HIIT用更少时间常能达到相近或更好的效果，对代谢指标的改善也不逊色。但它主观负荷高、受伤与放弃风险大，对初学者、心血管疾病患者需谨慎评估。长期效果取决于能否坚持，因此"更好"的方案往往是两者结合并匹配个人偏好与恢复能力。
For raising VO2 max, HIIT often achieves similar or better results in less time, and its metabolic benefits are comparable. But perceived effort is high, with greater risk of injury and dropout, so beginners and people with cardiovascular disease need careful assessment. Long-term benefit depends on adherence, so the "better" plan usually mixes both and matches personal preference and recovery capacity.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
《默克家庭医学手册》Merck Manual Home Health Handbook 中译版,人民卫生出版社
The Merck Manual Home Health Handbook, Chinese ed., PMPH
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787117181631（按标识回读: 默克家庭医学手册）
#HIIT #有氧训练
为什么力量训练对骨骼健康很重要？
Why does strength training matter for bone health?
骨组织会响应机械负荷重塑：肌肉牵拉与冲击刺激成骨细胞活动，使骨密度维持或提高，这被称为"骨的适应性负荷"原理。因此负重与抗阻运动（而非仅游泳、骑车）对预防骨质疏松尤为关键，对绝经后女性和老年人意义更大。开始新训练计划前，有骨折史或骨密度明显偏低者宜先咨询专业人员。
Bone remodels in response to mechanical load: muscle pull and impact stimulate osteoblast activity, maintaining or increasing bone density — the principle of adaptive bone loading. So weight-bearing and resistance exercise, rather than swimming or cycling alone, matter most for preventing osteoporosis, especially for postmenopausal women and older adults. Anyone with prior fractures or low bone density should consult a professional before starting.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
《默克家庭医学手册》Merck Manual Home Health Handbook 中译版,人民卫生出版社
The Merck Manual Home Health Handbook, Chinese ed., PMPH
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787117181631（按标识回读: 默克家庭医学手册）
#力量训练 #骨密度
素食者为什么更要注意铁和维生素B12？
Why do vegetarians need to watch iron and vitamin B12?
植物性食物提供的是非血红素铁，吸收率低于肉类中的血红素铁，且易被茶、咖啡中的多酚和谷物中的植酸抑制；搭配维生素C丰富的食物可明显提升吸收。维生素B12几乎只存在于动物性食品和强化食品中，严格素食者需依靠强化食品或补充剂，长期缺乏会导致贫血与神经损害。
Plant foods supply non-haem iron, absorbed less efficiently than haem iron from meat and inhibited by polyphenols in tea and coffee and phytate in grains; pairing with vitamin C–rich foods improves uptake markedly. Vitamin B12 occurs almost only in animal and fortified foods, so strict vegans need fortified products or supplements — prolonged deficiency causes anaemia and nerve damage.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
《默克家庭医学手册》Merck Manual Home Health Handbook 中译版,人民卫生出版社
The Merck Manual Home Health Handbook, Chinese ed., PMPH
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787117181631（按标识回读: 默克家庭医学手册）
#素食 #铁 #维生素B12