> Are you saying that American Heart Association, NHS UK, British Dietetic Association and WHO recommendations are wrong because people can't be bothered to change their diets.
Those recommendations are not inherently incorrect. If obtaining Omega-3 from algae were not an available option, it would be a viable choice. If fish populations were not severely depleted, it would be a suitable choice. If there were considerably fewer humans, it would be a reasonable option. However, it appears that environmental impacts were not adequately considered in their viewpoints.
I have selected a citation affirming that plant-only diets are a viable way forward.
> experts recommendation exist in the context of culture
Culture is just stories we tell ourselves. Those stories may not be true or moral or right. It's better explained in this short video: https://www.youtube.com/watch?v=E7JE8j5Ncmw
> As a society we don't know how to generate a lot of food at the lowest price possible without the side effect of massive harms.
But we do know how to generate a lot of food without excessive harms. The only problem is ... price. But there we're getting to the problems of our current system. That would be even harder and longer discussion.
> Metabolic illnesses have significant increased in the last 100 years ... likely contributing cause is our current lifestyle of using artificial light and Sedentary lifestyle
Other possible culprits for the increase in metabolic diseases in past decades include factors such as changes in dietary patterns, increased consumption of processed foods high in sugar and unhealthy fats and lack of physical activity.
We're eating much more meat/dairy that we've been eating in centuries before, and we're using too much poisons in our food production.
> for many people eating plants only is extremely difficult
Many individuals have depleted gut microbiomes due to Western dietary patterns (e.g., processed foods, sugar, lack of fiber), but this can be resolved through dietary changes. The number of individuals who require a diet solely comprised of animal-derived foods would be extremely small. Veganism's definition also includes a practicality clause.
"Veganism is a philosophy and way of living which seeks to exclude—as far as is possible and practicable—all forms of exploitation of, and cruelty to, animals for food, clothing or any other purpose; and by extension, promotes the development and use of animal-free alternatives for the benefit of animals, humans and the environment. In dietary terms it denotes the practice of dispensing with all products derived wholly or partly from animals."