Cream is high in saturated fat.
Harvard:
A ketogenic diet has been shown to provide short-term benefits in some people including weight loss and improvements in total cholesterol, blood sugar, and blood pressure. However, these effects after one year when compared with the effects of conventional weight loss diets are not significantly different. [10]
Eliminating several food groups and the potential for unpleasant symptoms may make compliance difficult. An emphasis on foods high in saturated fat also counters recommendations from the Dietary Guidelines for Americans and the American Heart Association and may have adverse effects on blood LDL cholesterol. However, it is possible to modify the diet to emphasize foods low in saturated fat such as olive oil, avocado, nuts, seeds, and fatty fish.
Brigham-Young:
A new study showed that too many or too little carbohydrates can lead to higher mortality rates. Researchers from Brigham & Womens Hospital, Harvard University and the University of Minnesota studied 15428 adults, investigating the association between the percentage of calories from carbohydrates and all-cause mortality.
"Higher mortality rates (higher risk of death) was found in people who consumed less that 40% of their calories from carbohydrates or more than 70%."
They then further examined this association, by combining this data with data for carbohydrate intake reported from seven multinational prospective studies in a meta-analysis. They also assessed whether the substitution of animal or plant sources of fat and protein for carbohydrate affected mortality.
Higher mortality rates was found in people who consumed less that 40% of their calories from carbohydrates or more than 70%. In addition, those who replaced carbohydrates with animal based proteins and fats had a higher mortality rate than those who replaced carbohydrates with plant sources such as vegetables, legumes and plant fats such as olive oil or avocado.