science

From the article:

However, this study shows that low-carbohydrate and low-fat diets may not be the healthiest strategy for promoting longevity, as their short-term benefits could potentially be outweighed by long-term risk.

If you read the study, the lowest mortality is around 50% of calories from carbohydrates. There's a u-shaped curve, although low carb seems more dangerous than high carb.

That seems to suggest something like the Mediterranean diet or a traditional Japanese diet, not very low fat diets.