put on weight with out increasing cholestrol

i want to ask that how we can increase weight with increasing our LDL?
because my father is man of 50 and his LDL is 122 but he is under weight.his height is almost 5feet 9 inches and his weight is 59 kg or some time 60 kg.

[NTB]

a quick answer for extra calories: olive oil, which might lower LDL and raise HDL. You should look at the ratio of HDL to LDL instead of LDL alone. Did you know that roughly 50% of people who have heart attacks have normal LDL levels?

Eating a lot of carbs might raise triglycerides, which can be as bad as LDL. Carbs can also raise blood glucose and insulin levels. So you might concentrate on low glycemic carbs.

Nothing is hardly ever simple. Is LDL bad? Some say that it is only the "small dense" LDL particles which are bad. The "light fluffy" LDL doesn't harm the arteries. Fish oil might make a person's LDL more toward the light fluffy, and less of the small dense LDL.

You can also find online some "ideal weight" calculators, which might show your father just below the ideal range for his height.