卡路里不是一个有意义的概念（"根本不存在卡路里这回事"）；他的体系建立在高热量摄入之上，人们一边吃糖、果汁、脂肪、土豆和米，一边减重，因为在"零胰岛素"的情况下不会形成脂肪（这段话接着说："即使你喝油，即使你吞下成袋的糖"）。他在别处说，他每天喝 6 升甘蔗汁，并吃 baladi 酥油、米和土豆。
原始表述
سعرات مش حاجه اسمها سعرات انا نظامي قايم على السعرات العاليه وبتخس تاكل سكر وبتخس تشرب عصاير وبتخس تاكل دهون وبتخس تاكل بطاطس ورز وبتخس اه ما فيش سعرات بقى باشا انا نضفت جهازك الهضمي زيرو انسولين زيرو انسولين يبقى زيرو كسبان او كسب ا ليبيدز او دهون يعني انت طول ما انت زيرو انسولين ما فيش تكوين دهون
按来源为原话. 译文由本项目提供；以阿拉伯语原文为准。
译文
卡路里不是一个有意义的概念（"根本不存在卡路里这回事"）；他的体系建立在高热量摄入之上，人们一边吃糖、果汁、脂肪、土豆和米，一边减重，因为在"零胰岛素"的情况下不会形成脂肪（这段话接着说："即使你喝油，即使你吞下成袋的糖"）。他在别处说，他每天喝 6 升甘蔗汁，并吃 baladi 酥油、米和土豆。
出处
- 来源状态
- 视频转录文本（本人原话）
- 归属
- Elawady (machine transcript)
- 视频
- Dr Diaa Al Awady د ضياء العوضي is live! مفيش حاجه سعرات مفيش حاجه اسمها نشويات (打开来源)
- 发布日期
- 2025年8月7日
- 时间戳
- 0:18:21 (在原视频 YouTube 自动字幕轨中的位置；可确认该内容出现的位置，但不能确认说话人是谁)
- 归属的不确定性
- Archive transcript (YouTube CC or AI-generated); no timestamps; wording may contain speech-recognition errors; speaker turns are not marked, the excerpt was judged to be Elawady's own speech from context.
- 所声称的机制
With 'zero insulin' (achieved by a 'clean' digestive system), no fat is formed regardless of energy intake.
- 所声称的健康影响
Weight loss despite high energy intake from sugar, juices, fats, potatoes and rice.
- 涉及人群
Followers of the system, including people trying to lose weight.
- Elawady 设定的地域限制
none found
来源版本存在差异
انا اثبتت لك ان ما فيش حاجه اسمها سعرات انا بشرب عصير 6 لتر عصير قصب في اليوم ها سعرات اكتر من كده ايه وباكل سمنه بلدي كل يوم وباكل رز وبطاطس كل يوم
I have proven to you that there is no such thing as calories: I drink 6 litres of sugar-cane juice a day - what more calories than that? - and I eat baladi ghee every day and rice and potatoes every day.
- 来源状态
- 视频转录文本（本人原话）
- 归属
- Elawady (machine transcript)
- 视频
- ارتفاع ضغط البطن والاضطراب الهرموني وظهور كل ماهو مناعي #ضياء_العوضي (打开来源)
- 发布日期
- 2026年1月10日
- 时间戳
- 0:48:11 (在原视频 YouTube 自动字幕轨中的位置；可确认该内容出现的位置，但不能确认说话人是谁)
- 归属的不确定性
- Archive transcript (YouTube CC or AI-generated); no timestamps; wording may contain speech-recognition errors; speaker turns are not marked, the excerpt was judged to be Elawady's own speech from context.
السعرات السعرات يا نورا السعرات هحط جدول مرفق ب وصيتي بالسعرات المطلوبه في اليوم لكن هي اراوند 1200 يعني مش انت بنوته يا نورا صح بنوته صغنطوطه خلاص خليكي 1200 سعرات وحاولي تقللي
Calories, calories, Noura: I will attach a table with my advice on the required calories per day, but it is around 1,200 ... you are a little girl, right? So stay at 1,200 calories and try to reduce.
- 来源状态
- 视频转录文本（本人原话）
- 归属
- Elawady (machine transcript)
- 视频
- Dr Diaa Al Awady د ضياء العوضي is live! الدم -٢- تحليل الدهون (打开来源)
- 发布日期
- 2025年8月17日
- 时间戳
- 0:04:00 (在原视频 YouTube 自动字幕轨中的位置；可确认该内容出现的位置，但不能确认说话人是谁)
- 归属的不确定性
- Archive transcript (YouTube CC or AI-generated); no timestamps; wording may contain speech-recognition errors; speaker turns are not marked, the excerpt was judged to be Elawady's own speech from context. Apparently contradictory remark ten days after e3z71BwgAmA; the tone (sincere advice or irony) cannot be determined from the transcript.
科学评估
错误 – 该说法与可靠证据相矛盾。
证据确定性: 高 – 进一步研究极不可能改变该评估。
1. 说法是什么？
Calories do not matter; his high-calorie system makes people lose weight because insulin is 'zero', so no fat can be formed even with large amounts of sugar or oil.
2. 哪些内容可证实是正确的？
Calorie counting is not the only way to lose weight: the type of food strongly influences how much people eat. In an NIH inpatient trial, people ate about 508 kcal/day more and gained 0.9 kg in two weeks on an ultra-processed diet, versus losing 0.9 kg on an unprocessed diet (A-UPF-01). Energy expenditure is not simply additive: above moderate activity levels total expenditure plateaus at about 2,600 kcal/day (I-SYS-07). People who follow his system may lose weight if their total intake falls, for example through one meal a day or avoiding flour products and soft drinks. One randomised feeding trial found that diet composition can change energy expenditure (about 200 kcal/day more on a low- than on a high-carbohydrate diet; I-INS-118), but in the opposite direction to his advice and measured in calories.
3. 哪些内容是错误或夸大的？
Weight loss requires a sustained energy deficit. In a metabolic-ward study at equal calories, cutting fat (which barely changed insulin) caused more body-fat loss (89 g/day) than cutting carbohydrate (53 g/day), even though carbohydrate restriction lowered insulin (I-INS-09); this directly contradicts 'insulin, not calories, decides fat'. In the 12-month DIETFITS trial, low-fat and low-carbohydrate diets produced similar weight loss (-5.3 vs -6.0 kg), with no interaction with insulin secretion (I-SYS-05). Time-restricted eating added no significant weight loss beyond calorie restriction (I-FAST-03). Insulin does not fall to zero in people with a working pancreas (see C-FAST-01). A meta-analysis of 32 controlled feeding studies found slightly more fat loss with lower-fat than with lower-carbohydrate diets at equal calories (16 g/day; I-INS-117).
4. 哪些内容仍不明确？
How many followers actually lose weight on the system, and why, has not been studied. One later remark in a live stream recommends about 1,200 kcal/day to a viewer; whether this was meant seriously is unclear.
5. 哪些研究支持该说法？
No study supports the claim as stated. A-UPF-01 shows that the type of food affects how much people eat, and I-SYS-07 that physiology constrains energy expenditure; both work within an energy-balance framework in which calories matter. I-INS-118 shows a modest effect of diet composition on energy expenditure, in the low-carbohydrate direction.
6. 哪些研究与该说法相矛盾？
I-INS-09, I-SYS-05, I-FAST-03, I-FAST-02; A-UPF-01 (weight change tracked energy intake closely, r=0.8, with weight gain on +508 kcal/day and loss on the lower-intake diet, while total sugar intake was similar on both diets, 93.3 vs 96.6 g/day); I-SUG-03 (EFSA: excess energy intake leading to positive energy balance is the main mechanism by which sugars contribute to chronic metabolic disease; SSBs and fruit juices causally linked to obesity/T2DM with high/moderate certainty). I-SYS-07 measures and models expenditure in kcal/day within an energy-balance framework; constrained expenditure makes energy intake more, not less, important. I-INS-117 and I-INS-119 (controlled feeding).
7. 对德国和欧洲而言情况如何？
European and German obesity guidance relies on reducing energy intake through dietary quality and behaviour; no guideline was fetched for this review.
8. 关于埃及的已知情况是什么？
Obesity and type 2 diabetes are common in Egypt; advice that sugar and fats can be eaten without limit is particularly risky in this setting.
9. 合理的实际结论是什么？
食物的种类会影响人们吃多少，但卡路里仍然很重要。大量的甘蔗汁、糖、酥油、米和土豆提供大量能量，当摄入超过消耗时就会发生体重增加。
评估详情
- 证据确定性的依据
Controlled metabolic-ward and randomised trials consistently show that body-fat change follows energy balance, and that lowering insulin without an energy deficit does not produce extra fat loss (I-INS-09); insulin is never 'zero' in people with a functioning pancreas.
- 来源质量
Elawady's own words in an archive machine transcript (live stream); exact wording may contain recognition errors. One later remark (YI-QaTyMlnw) mentions a 1,200-kcal target; its intent is unclear.
- 地区可推广性
Energy balance is physiological and applies universally.
- 个体例外情况
Weight change for a given intake varies between individuals (body size, activity, adaptive changes in energy expenditure, I-SYS-07), but no group is exempt from energy balance.
- 说法的地域范围
- 普遍性（生物学/医学）
- 最近审核
- 2026年10月26日 初步
科学证据详解
已被科学证据否定 – 高质量证据显示情况恰恰相反，或该说法与已确立的生理学知识相矛盾。
研究问题: In adults, does body fat change depend on energy intake relative to expenditure, or can people lose weight on a high-calorie diet rich in sugar, juice, fat, rice and potatoes because insulin is 'zero'?
研究问题详解 (PICO)
- 人群
- Adults (with and without obesity/diabetes)
- 干预或暴露
- High-calorie diet high in sugar/fat (his system)
- 对照
- Energy-controlled diets of different composition
- 地域范围
- universal biology
- 结局指标
- Body fat change
- Energy expenditure
- Ad libitum energy intake
研究结果按作者报告呈现。我们的评估见下文。
哪些证据支持该说法？
Low-carbohydrate diets and calories burned after weight loss
Randomised feeding trial of carbohydrate share during weight maintenance.
- 实际结果
- Low vs high carbohydrate: +209 kcal/d (91-326) energy expenditure (ITT).
- 方法学质量
- moderate (analysis disputed; erratum)
- 相关性
- indirect: composition can matter, but in the low-carbohydrate direction
- 局限
- Opposite direction to a sugar-rich diet; measured in kcal.
Ultra-processed vs unprocessed diet in hospital
Hall KD et al.. Cell Metab 2019 · PMID 31105044 · DOI 10.1016/j.cmet.2019.05.008 随机对照试验全文，含结构化偏倚风险评估NIH inpatient trial of ultra-processed vs unprocessed diets.
- 实际结果
- +508 kcal/d intake and +0.9 kg in 2 weeks on ultra-processed food vs -0.9 kg unprocessed; weight change correlated with energy intake (r=0.8).
- 方法学质量
- high (inpatient RCT)
- 相关性
- partly supports 'food type matters'
- 局限
- Works through energy intake.
哪些证据不支持该说法？
Low-fat vs low-carb in a metabolic ward
Hall KD et al.. Cell Metab 2015 · PMID 26278052 · DOI 10.1016/j.cmet.2015.07.021 随机对照试验全文，含结构化偏倚风险评估Metabolic-ward study: fat vs carbohydrate restriction at equal calories.
- 实际结果
- Fat loss 89 g/d (fat restriction) vs 53 g/d (carbohydrate restriction, which lowered insulin).
- 方法学质量
- high (controlled feeding)
- 相关性
- direct
- 局限
- Short (6 days).
Calories, carbohydrates and body fat in controlled feeding studies
Hall KD, Guo J. Gastroenterology 2017 · PMID 28193517 · DOI 10.1053/j.gastro.2017.01.052 Meta分析已核查摘要新增Meta-analysis of 32 isocaloric controlled feeding studies.
- 实际结果
- Lower-fat diets: +26 kcal/d expenditure and +16 g/d fat loss vs lower-carbohydrate diets.
- 方法学质量
- moderate
- 相关性
- direct
- 局限
- Small effects.
Low-fat and low-carb diets led to similar weight loss
DIETFITS 12-month RCT.
- 实际结果
- Low-fat -5.3 kg vs low-carbohydrate -6.0 kg; no interaction with insulin secretion.
- 方法学质量
- high
- 相关性
- direct
- 局限
- Free-living.
总体证据说明了什么？
基于上述研究的编辑评估——其本身并非研究结果。
哪种观点有更好的证据支持？
Energy balance governs body-fat change; food quality influences how much people eat.
为什么有些研究权重更大
Controlled-feeding and metabolic-ward trials with measured intake outweigh mechanistic insulin arguments; the one trial favouring an insulin effect points to low carbohydrate, not high sugar.
因果关系是否已确立？ 是，已确立 Controlled feeding and randomised trials.
仍存在的不确定性
Individual variation in energy expenditure; long-term adaptations.
合理的结论
Calories matter. A diet rich in sugar, juice, ghee, rice and potatoes is energy-dense; insulin is never 'zero' in people with a working pancreas.
为什么研究结果看起来互相矛盾？
这是否取决于国家？
- 一般生物学效应
- Universal.
- 饮食习惯
- Sugar-cane juice and ghee are energy-dense Egyptian foods.
- 食品原产地
- Not applicable.
- 污染物
- Not applicable.
- 本国生产条件
- Not applicable.
- 法律规则
- Not applicable.
- 实际监测数据
- Obesity and diabetes are common in Egypt.
足以改变结论的地区差异没有可靠数据支持。
统计复核
- CI symmetry (linear) for kcal differences – 209 (91-326) and 278 (144-411) symmetric 已重新计算
- Cumulative energy difference – 689 kcal/d x 14 d = 9646 kcal less intake on the high-carbohydrate low-fat whole-food diet 已重新计算
总体证据的确定性（GRADE，简化版）
- 主要结局
- Body-fat change under energy surplus versus insulin level
- 起始等级
- 高（随机试验）
- 结果
- 高
由单名审查者参照 GRADE 方法进行的简化评估；并非正式的 GRADE 专家组评估。GRADE 评价的是针对某一结局的整体证据，而非单项研究。
已核查的临床指南和官方声明
- WHO: Healthy diet fact sheet (2026) · 原始文献
Total energy intake should be balanced with energy expenditure; free sugars <10% of energy (ideally <5%); total fat <=30% of energy to help prevent unhealthy weight gain.
检索策略
本次审查的文献检索记录（检索式采用原数据库语法）。
| 数据库 | 日期 | 检索式 | 检索目标 | 命中数 | 纳入数 |
|---|---|---|---|---|---|
| PubMed | 2026年10月26日 | Effects of a low carbohydrate diet on energy expenditure during weight loss maintenance randomized trial BMJ 2018 | 支持性证据 | 1 | |
| PubMed | 2026年10月26日 | Obesity energetics: body weight regulation and the effects of diet composition Gastroenterology 2017 | 反对性证据 | 1 | |
| PubMed | 2026年10月26日 | Effect of a plant-based, low-fat diet versus an animal-based, ketogenic diet on ad libitum energy intake Nat Med 2021 | 反对性证据 | 1 | |
| Europe PMC | 2026年10月26日 | ("carbohydrate-insulin model" AND (obesity) AND (test OR trial OR review)) AND PUB_YEAR:[2021 TO 2026] | 支持性证据 | 144 | |
| Europe PMC | 2026年10月26日 | (sugar-sweetened beverages OR "fruit juice") AND (weight gain OR "body weight") AND (meta-analysis) AND (randomized OR cohort) AND PUB_YEAR:[2013 TO 2026] | 反对性证据 | 6591 | |
| WHO website | 2026年10月26日 | WHO healthy diet fact sheet | 指南 | 1 |
核查深度如何？
10 项相关研究：5 项核查了全文（其中 5 项进行了结构化偏倚风险评估），5 项基于摘要核查，0 项仅核查了文献信息。 尚未进行由两名独立审查者完成的正式评估，也尚未进行独立的人类专家审核。
最近一次科学审核: 2026年10月26日
通俗解释
Elawady 医生说，根本不存在卡路里这回事，人们在他的体系下一边吃糖、果汁、脂肪、米和土豆，一边减重，因为他们的胰岛素是"零"。在严格测量每一口食物的细致研究中，只有当人们摄入的能量少于消耗的能量时，体脂才会下降。在不少吃的情况下降低胰岛素，并没有燃烧更多脂肪。他说得对的一点是食物种类很重要：人们吃高度加工的食物时会吃得更多。但卡路里并非无关紧要。
与该说法相关的研究
支持该说法的研究 (0)
该组中没有研究。
与该说法相矛盾或限制该说法的研究 (9)
-
Low-fat vs low-carb in a metabolic ward
Hall KD et al.. Cell Metab 2015 · PMID 26278052 · DOI 10.1016/j.cmet.2015.07.021随机对照试验独立交叉核查全文，含结构化偏倚风险评估Cutting fat led to more fat loss than cutting carbs, even though cutting carbs lowered insulin more.
该研究是否支持这一具体说法？ 否 · 方法学质量: 高 · 证据确定性：见该说法的总体评估
研究通俗解读
- 研究人员想了解什么？
Does carbohydrate restriction (lower insulin) cause more fat loss than fat restriction at equal calories?
- 研究是如何开展的？
Randomised crossover metabolic-ward study
- 研究了多少人、动物或样本？
19 adults with obesity randomised (17 completed both diets)
- 实际发现了什么？
Fat loss 89 g/day on reduced-fat vs 53 g/day on reduced-carbohydrate (463 g vs 245 g over 6 days), although only the low-carb diet lowered insulin (by 22%).
- 观察到的效应有多大？
+36 g/day with fat restriction
- 研究结果对日常生活意味着什么？
Calories matter; insulin is not the only driver.
- 该研究有哪些局限？
Only 6 days per diet; small sample; fat loss was a secondary outcome; long-term predictions come from a computer model; moderate (not very-low) carbohydrate restriction.
- 它对 Elawady 的具体说法说明了什么？
Contradicts C-INS-01 ('insulin the only cause of fat').
- 研究结果是否适用于德国和欧洲？
Physiology transferable.
- 从该研究中明确不能得出什么结论？
Long-term weight outcomes.
-
Low-fat and low-carb diets led to similar weight loss
Gardner CD et al.. JAMA 2018 · PMID 29466592 · DOI 10.1001/jama.2018.0245随机对照试验独立交叉核查已核查摘要After a year, weight loss was 5.3 kg vs 6.0 kg - no real difference.
该研究是否支持这一具体说法？ 是 · 方法学质量: 高 · 证据确定性：见该说法的总体评估
研究通俗解读
- 研究人员想了解什么？
Compare diets.
- 研究是如何开展的？
RCT.
- 研究了多少人、动物或样本？
609.
- 实际发现了什么？
No difference.
- 观察到的效应有多大？
0.7 kg.
- 研究结果对日常生活意味着什么？
Total diet quality and quantity matter more than fat share.
- 该研究有哪些局限？
Adherence.
- 它对 Elawady 的具体说法说明了什么？
Supports 'fat is not the origin'.
- 研究结果是否适用于德国和欧洲？
High.
- 从该研究中明确不能得出什么结论？
Long-term weight maintenance.
-
Time-restricted eating plus calorie restriction
Liu D et al.. N Engl J Med 2022 · PMID 35443107 · DOI 10.1056/NEJMoa2114833随机对照试验独立交叉核查已核查摘要★ 关键研究Adding an 8-hour eating window to calorie restriction did not significantly improve weight loss.
该研究是否支持这一具体说法？ 部分支持 · 方法学质量: 高 · 证据确定性：见该说法的总体评估
研究通俗解读
- 研究人员想了解什么？
Time-restricted eating plus calorie restriction vs calorie restriction alone
- 研究是如何开展的？
RCT, 12 months
- 研究了多少人、动物或样本？
139; Adults with obesity
- 实际发现了什么？
No significant added benefit.
- 观察到的效应有多大？
-1.8 kg (n.s.)
- 研究结果对日常生活意味着什么？
Calorie reduction is what matters.
- 该研究有哪些局限？
Single country
- 它对 Elawady 的具体说法说明了什么？
- 研究结果是否适用于德国和欧洲？
Chinese population; physiology transferable.
- 从该研究中明确不能得出什么结论？
Effects without calorie restriction.
-
Alternate-day fasting vs eating less every day
Trepanowski JF et al.. JAMA Intern Med 2017 · PMID 28459931 · DOI 10.1001/jamainternmed.2017.0936随机对照试验独立交叉核查全文，含结构化偏倚风险评估★ 关键研究Both approaches gave similar weight loss after a year; fasting had more dropouts and higher LDL.
该研究是否支持这一具体说法？ 部分支持 · 方法学质量: 中 · 证据确定性：见该说法的总体评估
研究通俗解读
- 研究人员想了解什么？
Alternate-day fasting vs daily calorie restriction on weight and CV risk
- 研究是如何开展的？
Single-centre RCT, 1 year
- 研究了多少人、动物或样本？
100; Metabolically healthy obese adults, mean BMI 34
- 实际发现了什么？
No superiority.
- 观察到的效应有多大？
-6.0% vs -5.3% weight
- 研究结果对日常生活意味着什么？
Choose what one can sustain.
- 该研究有哪些局限？
Small; 38% of fasting group dropped out; mostly healthy women; fast days still included ~500 kcal; lead author wrote a book on this diet.
- 它对 Elawady 的具体说法说明了什么？
- 研究结果是否适用于德国和欧洲？
US; transferable.
- 从该研究中明确不能得出什么结论？
Long-term disease outcomes.
-
Ultra-processed vs unprocessed diet in hospital
Hall KD et al.. Cell Metab 2019 · PMID 31105044 · DOI 10.1016/j.cmet.2019.05.008随机对照试验被 Tayebat 档案网站引用全文，含结构化偏倚风险评估★ 关键研究People ate about 500 calories more per day and gained weight on ultra-processed food.
该研究是否支持这一具体说法？ 是 · 方法学质量: 高 · 证据确定性：见该说法的总体评估
研究通俗解读
- 研究人员想了解什么？
Do ultra-processed foods affect energy intake?
- 研究是如何开展的？
Inpatient randomized crossover trial, 2 weeks per diet, ad libitum.
- 研究了多少人、动物或样本？
20; Weight-stable adults, mean age 31, BMI 27
- 实际发现了什么？
Energy intake +508 ± 106 kcal/day on UPF (p=0.0001); carbohydrate +280, fat +230 kcal/day; protein unchanged; weight +0.9 ± 0.3 kg (UPF) vs -0.9 ± 0.3 kg (unprocessed).
- 观察到的效应有多大？
+508 kcal/day; +0.9 kg vs -0.9 kg
- 研究结果对日常生活意味着什么？
Ultra-processed food can make people eat more.
- 该研究有哪些局限？
Only 20 people, 2 weeks per diet, in hospital conditions; no washout between diets; participants knew which diet they ate; the cause of the extra eating (e.g. energy-dense food, faster eating) is not clear.
- 它对 Elawady 的具体说法说明了什么？
Core evidence for C-UPF-02.
- 研究结果是否适用于德国和欧洲？
High.
- 从该研究中明确不能得出什么结论？
Long-term health outcomes.
-
EFSA: how much sugar is safe?
EFSA NDA Panel et al.. EFSA J 2022 · PMID 35251356 · DOI 10.2903/j.efsa.2022.7074风险评估独立交叉核查全文，含结构化偏倚风险评估★ 关键研究EFSA found no safe intake level and advises keeping added and free sugars as low as possible.
该研究是否支持这一具体说法？ 否 · 方法学质量: 高 · 证据确定性：见该说法的总体评估
研究通俗解读
- 研究人员想了解什么？
Can a UL or safe level for dietary sugars be set?
- 研究是如何开展的？
Regulatory scientific opinion with systematic reviews.
- 研究了多少人、动物或样本？
Not applicable; General population
- 实际发现了什么？
Sugars are a well-established hazard for caries; RCTs on surrogate endpoints show causal positive relationship of added/free sugars with obesity and dyslipidaemia (moderate certainty), NAFLD and T2D (low), hypertension (very low); no safe level identified; intake of added and free sugars should be as low as possible in a nutritionally adequate diet.
- 观察到的效应有多大？
Not applicable
- 研究结果对日常生活意味着什么？
Applies to sugar, honey and syrups alike.
- 该研究有哪些局限？
Trials looked at markers (weight, liver fat, blood fats) rather than diseases; cohort studies mostly compared sugar with other calories at equal total energy; few data below 10% of energy.
- 它对 Elawady 的具体说法说明了什么？
- 研究结果是否适用于德国和欧洲？
Directly applicable in EU/Germany.
- 从该研究中明确不能得出什么结论？
It cannot name a safe daily amount of sugar; it does not show that sugar is harmful when it does not add extra calories, except for tooth decay.
-
Moving more does not burn proportionally more energy
Pontzer H et al.. Curr Biol 2016 · PMID 26832439 · DOI 10.1016/j.cub.2015.12.046横断面研究独立交叉核查全文，含结构化偏倚风险评估Daily energy use levels off at higher activity.
该研究是否支持这一具体说法？ 否 · 方法学质量: 中 · 证据确定性：见该说法的总体评估
研究通俗解读
- 研究人员想了解什么？
Test energy expenditure models.
- 研究是如何开展的？
Doubly labelled water.
- 研究了多少人、动物或样本？
332 adults aged 25-45 from Ghana, South Africa, Seychelles, Jamaica and the USA.
- 实际发现了什么？
Energy expenditure rose with activity at low levels but levelled off at about 2,600 kcal/day above a moderate activity level; activity explained only about 7% of adjusted expenditure.
- 观察到的效应有多大？
Change point 230 CPM/d (95% CI 44-428); slope above it 0.21 +/- 0.35 (p=0.54).
- 研究结果对日常生活意味着什么？
Diet is central for weight.
- 该研究有哪些局限？
Cross-sectional; accelerometry imperfect; some RMR data missing.
- 它对 Elawady 的具体说法说明了什么？
Contradicts inactivity-only explanation.
- 研究结果是否适用于德国和欧洲？
Moderate.
- 从该研究中明确不能得出什么结论？
Long-term causation; that exercise does not matter for health or weight; that calories are irrelevant.
-
Calories, carbohydrates and body fat in controlled feeding studies
Hall KD, Guo J. Gastroenterology 2017 · PMID 28193517 · DOI 10.1053/j.gastro.2017.01.052Meta分析独立交叉核查已核查摘要★ 关键研究When calories were fixed, cutting fat led to slightly more fat loss than cutting carbohydrate, even though carbohydrate cuts lower insulin.
At equal calories, lower-fat diets gave slightly more fat loss than lower-carbohydrate diets.
该研究是否支持这一具体说法？ 否 · 方法学质量: 中 · 证据确定性：见该说法的总体评估
研究通俗解读
- 研究人员想了解什么？
Test whether lowering insulin via low-carbohydrate diets increases fat loss.
- 研究是如何开展的？
Meta-analysis of 32 controlled feeding studies.
- 研究了多少人、动物或样本？
Adults in metabolic studies.
- 实际发现了什么？
Lower-fat diets: +26 kcal/d expenditure, +16 g/d fat loss.
- 观察到的效应有多大？
Small effects.
- 研究结果对日常生活意味着什么？
Insulin is one factor, but calories matter.
- 该研究有哪些局限？
Short studies.
- 它对 Elawady 的具体说法说明了什么？
Contradicts 'insulin is the only cause of obesity'.
- 研究结果是否适用于德国和欧洲？
Applicable.
- 从该研究中明确不能得出什么结论？
Cannot settle long-term diet debates.
-
Low-fat plant diet versus ketogenic animal diet: how much people eat
Hall KD et al.. Nat Med 2021 · PMID 33479499 · DOI 10.1038/s41591-020-01209-1随机对照试验独立交叉核查已核查摘要★ 关键研究On a high-carbohydrate low-fat diet people ate about 690 fewer calories per day than on a ketogenic diet.
High-carbohydrate whole-food diet reduced intake; refutes the insulin-only model, not energy balance.
该研究是否支持这一具体说法？ 否 · 方法学质量: 中 · 证据确定性：见该说法的总体评估
研究通俗解读
- 研究人员想了解什么？
Test the carbohydrate-insulin model on food intake.
- 研究是如何开展的？
Inpatient crossover trial.
- 研究了多少人、动物或样本？
20 adults.
- 实际发现了什么？
Low-fat diet: 689 kcal/d less intake.
- 观察到的效应有多大？
-689 kcal/d.
- 研究结果对日常生活意味着什么？
Insulin is not the only factor in weight gain.
- 该研究有哪些局限？
Short and small.
- 它对 Elawady 的具体说法说明了什么？
Contradicts 'insulin is the only cause of obesity'.
- 研究结果是否适用于德国和欧洲？
Applicable.
- 从该研究中明确不能得出什么结论？
Cannot predict long-term weight change.
该组中没有被标记为关键研究的研究。
结果不一或不明确的研究 (1)
-
Low-carbohydrate diets and calories burned after weight loss
Ebbeling CB et al.. BMJ 2018 · PMID 30429127 · DOI 10.1136/bmj.k4583随机对照试验独立交叉核查已核查摘要★ 关键研究People on a low-carbohydrate diet burned about 200 more calories per day than on a high-carbohydrate diet while keeping weight off.
Diet composition may modestly change energy expenditure, but in the low-carbohydrate direction and within an energy-balance framework.
该研究是否支持这一具体说法？ 部分支持 · 方法学质量: 中 · 证据确定性：见该说法的总体评估
研究通俗解读
- 研究人员想了解什么？
Test diet carbohydrate and energy expenditure.
- 研究是如何开展的？
Randomised trial over 20 weeks.
- 研究了多少人、动物或样本？
164 adults after weight loss.
- 实际发现了什么？
Low-carb: +209 kcal/d.
- 观察到的效应有多大？
52 kcal/d per 10% less carbohydrate.
- 研究结果对日常生活意味着什么？
Insulin may play some role in weight regulation.
- 该研究有哪些局限？
Results debated; correction published.
- 它对 Elawady 的具体说法说明了什么？
Partly supports a role of insulin, not 'only cause'.
- 研究结果是否适用于德国和欧洲？
Applicable.
- 从该研究中明确不能得出什么结论？
Cannot show insulin is the only cause.
该组中没有被标记为关键研究的研究。
地区背景
德国 / 欧盟
European and German obesity guidance relies on reducing energy intake through dietary quality and behaviour; no guideline was fetched for this review.
埃及
Obesity and type 2 diabetes are common in Egypt; advice that sugar and fats can be eaten without limit is particularly risky in this setting.
在我的国家适用什么？
一般科学评估
错误 食物质量会影响我们吃多少，但"卡路里不存在、不限量的糖和脂肪会导致减重"这一说法是错误的。
以下食品安全领域与该说法相关：
- 添加剂与加工
蜂蜜、糖、甜食
选择一个国家，查看针对该国已核查的信息。
局限：法律规则描述的是允许什么，而不是每一种食品实际含有什么。检测数据来自样本，只有结合其方法细节才有意义。
参考文献
- Calorie for Calorie, Dietary Fat Restriction Results in More Body Fat Loss than Carbohydrate Restriction in People with Obesity.. Hall KD et al.. Cell Metab 2015 · PMID 26278052 · DOI 10.1016/j.cmet.2015.07.021
- Effect of Low-Fat vs Low-Carbohydrate Diet on 12-Month Weight Loss in Overweight Adults and the Association With Genotype Pattern or Insulin Secretion: The DIETFITS Randomized Clinical Trial.. Gardner CD et al.. JAMA 2018 · PMID 29466592 · DOI 10.1001/jama.2018.0245
- Calorie Restriction with or without Time-Restricted Eating in Weight Loss.. Liu D et al.. N Engl J Med 2022 · PMID 35443107 · DOI 10.1056/NEJMoa2114833
- Effect of Alternate-Day Fasting on Weight Loss, Weight Maintenance, and Cardioprotection Among Metabolically Healthy Obese Adults: A Randomized Clinical Trial.. Trepanowski JF et al.. JAMA Intern Med 2017 · PMID 28459931 · DOI 10.1001/jamainternmed.2017.0936
- Ultra-Processed Diets Cause Excess Calorie Intake and Weight Gain: An Inpatient Randomized Controlled Trial of Ad Libitum Food Intake.. Hall KD et al.. Cell Metab 2019 · PMID 31105044 · DOI 10.1016/j.cmet.2019.05.008
- Tolerable upper intake level for dietary sugars.. EFSA NDA Panel et al.. EFSA J 2022 · PMID 35251356 · DOI 10.2903/j.efsa.2022.7074
- Constrained Total Energy Expenditure and Metabolic Adaptation to Physical Activity in Adult Humans.. Pontzer H et al.. Curr Biol 2016 · PMID 26832439 · DOI 10.1016/j.cub.2015.12.046
- Obesity Energetics: Body Weight Regulation and the Effects of Diet Composition.. Hall KD, Guo J. Gastroenterology 2017 · PMID 28193517 · DOI 10.1053/j.gastro.2017.01.052
- Effect of a plant-based, low-fat diet versus an animal-based, ketogenic diet on ad libitum energy intake.. Hall KD et al.. Nat Med 2021 · PMID 33479499 · DOI 10.1038/s41591-020-01209-1
- Effects of a low carbohydrate diet on energy expenditure during weight loss maintenance: randomized trial.. Ebbeling CB et al.. BMJ 2018 · PMID 30429127 · DOI 10.1136/bmj.k4583