Its cited in the post above man, just read it
https://www.who.int/news-room/fact-sheets/detail/healthy-diet
A healthy diet helps to protect against malnutrition in all its forms, as well as noncommunicable diseases (NCDs), including such as diabetes, heart disease, stroke and cancer.
Unhealthy diet and lack of physical activity are leading global risks to health.
Healthy dietary practices start early in life – breastfeeding fosters healthy growth and improves cognitive development, and may have longer term health benefits such as reducing the risk of becoming overweight or obese and developing NCDs later in life.
Energy intake (calories) should be in balance with energy expenditure. To avoid unhealthy weight gain, total fat should not exceed 30% of total energy intake (1, 2, 3). Intake of saturated fats should be less than 10% of total energy intake, and intake of trans-fats less than 1% of total energy intake, with a shift in fat consumption away from saturated fats and trans-fats to unsaturated fats (3), and towards the goal of eliminating industrially-produced trans-fats (4, 5, 6).
Limiting intake of free sugars to less than 10% of total energy intake (2, 7) is part of a healthy diet. A further reduction to less than 5% of total energy intake is suggested for additional health benefits (7).
Keeping salt intake to less than 5 g per day (equivalent to sodium intake of less than 2 g per day) helps to prevent hypertension, and reduces the risk of heart disease and stroke in the adult population (8).
WHO Member States have agreed to reduce the global population’s intake of salt by 30% by 2025; they have also agreed to halt the rise in diabetes and obesity in adults and adolescents as well as in childhood overweight by 2025 (9, 10).
Ok then, lets analyse this one sentence at a time
Energy intake (calories) should be in balance with energy expenditure
Agreed
To avoid unhealthy weight gain, total fat should not exceed 30% of total energy intake (1, 2, 3)
Utter nonsense, if calories are controlled (as per the first sentence) it doesn't matter if 5% or 80% of calories are from fat.
Lets have a look at their references 1, 2 and 3
1)Hooper L, Abdelhamid A, Bunn D, Brown T, Summerbell CD, Skeaff CM. Effects of total fat intake on body weight. Cochrane Database Syst Rev. 2015; (8):CD011834.
Absolute junk science, all this shows is people who reduce calories lost weight. In no way shape or form does this study demonstrate that limiting fats to 30% of calorie intake is inherently healthy.
2) Diet, nutrition and the prevention of chronic diseases: report of a Joint WHO/FAO Expert Consultation. WHO Technical Report Series, No. 916. Geneva: World Health Organization; 2003.
This isn't a study, doesn't belong as a reference
3) Fats and fatty acids in human nutrition: report of an expert consultation. FAO Food and Nutrition Paper 91. Rome: Food and Agriculture Organization of the United Nations; 2010
lol this is a extract from that study "There was convincing evidence that energy balance is critical to maintaining healthy body weight and ensuring optimal nutrient intakes, regardless of macronutrient distribution of energy as % total fat and % total carbohydrates" so once again this study doesn't not substantiate their 30% claim one iota
Next sentence
Intake of saturated fats should be less than 10% of total energy intake, and intake of trans-fats less than 1% of total energy intake, with a shift in fat consumption away from saturated fats and trans-fats to unsaturated fats (3)
I'm not going to stand up for trans fats, they're junk but I'm interested to see what the FAO report (3) has to say about saturated fats and why they should be limited to 10% of calorie intake for a 'healthy diet'
The primary reference to saturated fats in the report states that saturated fats are best replaced with PUSA due to the improvements seen in LDL/HDL ratios. However once again nothing to indicate that limiting saturated fats to 10% of calorific intake is inherently health. It also states explicitly that replacing saturated fats with carbohydrates doesn't improve cholesterol ratios
Furthermore the following 7 studies all refute the hypothesis that saturated fats raise cholesterol
The Bogalusa Heart Study
Tecumseh Study
Evans County Study
Israel Ischemic Heart Study
Health Professionals Follow-Up
Western Electric Study
Japanese Living In Hawaii Study
So like I said there's absolutely no evidence that limiting total fats to 30% of calorie intake nor saturated fats to 10% is inherently healthy