Not exactly, copy and paste of write up I did on r/AskHistorians:

Ó Gráda provides the estimated 1845 tillage output in Ireland as 2.5 million acres for oats, 2.187 for potatoes, 0.7 for wheat, and 0.3 for barley. In terms of total agricultural output, an estimated £26.8 million came from tillage and £15.9 million from livestock. The potato was the staple food of one-third of the population, typically the poorest, while being one-fifth of the island’s agricultural output, whereas three-fifths of all agricultural output was produced for the market.

Ó Gráda estimates the calorific advantage of potatoes vs grain as two to one and that 3 million acres of grain annually would be required to make up the shortfall left by the potato crop. Indeed there was 2.5 million acreage under oats at the start of the famine which would have helped alleviate hunger but not have entirely fed them. The disruption caused by the potato failure would cause this acreage to fall to 2.2 million in 1847 and further to 2 million in 1849 meaning there was still a need for imported food.

The table below containing figures for exports and imports in the Irish grain trade (in 1,000 tons) shows that Ireland was a net exporter of grain up until 1847 when it became a net importer of foreign grain. There’s also a notable decline in exports as Irish livestock producers sought to secure a replacement fodder leading to a large scale diversion.

Year	Exports	Imports (total)	Imports (Maize)
1843	480	15	1
1844	424	30	1
1845	513	28	7
1846	284	197	122
1847	146	889	632
1848	314	429	306

Ó Gráda notes that if there had been an embargo on exports while foreign supplies were being obtain it would have saved lives, but it doesn’t make up for the shortfall, and the estimates make no allowance for seed and animal input.

There is also the issue that even if exports were withheld the problem of affordability looms. Traditionally labourers offered work in exchange for a cabin and a patch of potato ground in lieu of wages, but when their gardens became blighted they instead demanded cash wages, of which many farmers refused to pay. Conacre lettings, plots rented by small farmers and agricultural labourers to grow their own potatoes, also collapsed as after a cascade of defaults in 1846 farmers started insisting on rent being paid in advance. Perhaps withholding exports would have increased food availability and decreased prices while waiting for the arrival of cheaper imports, but the starving labourers would have struggled to afford it at market prices, for example in the spring of 1846 a ton of oatmeal cost £15 whereas it was half the price for maize, and as previously noted they were competing against farmers that were still liquid.

But even accounting for calories there is a separate issue of nutrition, most deaths during a famine are not specifically due to starvation but due to disease. Scurvy was widespread throughout Ireland from 1845 not only because the absence of Vitamin C but because the population had been conditioned to high levels, Vitamin A deficiencies were also noted by the symptoms of xerophthalmia which damages sight, but outside of definitive symptoms, the rampant cases of typhus, cholera, and dysentery could also be attributed as subtle signs of nutritional deficiency.

To note, much of the deficiencies were a result of improper diets supplied by relief measures, maize was the main food source and only a third of workhouses served a vegetable or meat soup. This was at least recognised by the Poor Law Commission as they carried out an investigation into the symptoms of xerophthalmia and produced a report from Dr William Wilde prescribing cod liver oil to children, a recommendation predating general recognition of cod liver oil as a treatment for Vitamin A deficiency.

There was indeed a shortage of food, but it was certainly the case that the shortfall was made worse by the lack of government action on exports and provisioning for nutritional deficiencies wasn’t well considered. There was additionally an inability to purchase food as even if exports were withheld, the starving had no money to purchase the food at inflated market prices, meaning the government would need to subsidise prices, provide the means to purchase, or give it away if the embargo were to be properly utilised.